NEET Biology Ecosystem Question Bank

done Ecosystem Total Questions - 207

• question_answer1)
  In ecosystem lithosphere is concerned with
  A)
  Gases done clear
  B)
  Minerals done clear
  C)
  Water done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer2)
  Which of the following is producer of plant kingdom
  A)
  Melia done clear
  B)
  Ficus done clear
  C)
  Ziziphus done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer3)
  The net primary productivity of an ecosystem is
  A)
  Total weight of green plants - respiratory losses done clear
  B)
  Total weight of green plants + respiratory losses done clear
  C)
  Respiratory losses alone done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer4)
  Primary producer of an ecosystem is
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Both a and b done clear
  D)
  Green plants done clear
  View Solution play_arrow

• question_answer5)
  Which of the following are consumers of second order
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Top carnivores done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer6)
  When food energy passes from herbivores to carnivores
  A)
  Some energy is increased done clear
  B)
  Some energy is decreased done clear
  C)
  Remain unchanged done clear
  D)
  Not relevant done clear
  View Solution play_arrow

• question_answer7)
  What is studied under the ??microcosm??
  A)
  Ecosystem done clear
  B)
  Livings done clear
  C)
  Non-livings done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer8)
  Which of the cycle is concerned with energy flow in the ecosystem
  A)
  Food cycle done clear
  B)
  cycle done clear
  C)
  cycle done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer9)
  In a given ecosystem number of individuals in species remain more or less constant over a period of time. The constancy of number is maintained by
  A)
  Parasite done clear
  B)
  Predators done clear
  C)
  Man done clear
  D)
  Available food done clear
  View Solution play_arrow

• question_answer10)
  Which group of living organisms given below is a link in food chain between green plants and hawk
  A)
  Grasshopper, frog and snake done clear
  B)
  Grasshopper, rat and snake done clear
  C)
  Millipedes, centipedes and sparrow done clear
  D)
  Earthworm, hen and rat done clear
  View Solution play_arrow

• question_answer11)
  The bacteria which attack dead animals are
  A)
  First link of the food chain and are known as primary producers done clear
  B)
  Second link of the food chain and are herbivorous done clear
  C)
  Third link of the food chain and are tertiary consumers done clear
  D)
  The end of food chain and are decomposers done clear
  View Solution play_arrow

• question_answer12)
  Which one statement is correct regarding man made ecosystem
  A)
  They are highly efficient done clear
  B)
  They are poor in diversity done clear
  C)
  They are vulnerable to drought, floods and diseases done clear
  D)
  All are correct done clear
  View Solution play_arrow

• question_answer13)
  Phosphorus usually becomes a limiting factor at certain times of the year in which ecosystem
  A)
  Aquatic ecosystem done clear
  B)
  Grassland ecosystem done clear
  C)
  Forest ecosystem done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer14)
  Food and energy relationships among living components of ecosystem is generally referred as
  A)
  Biocoenosis done clear
  B)
  Microcosm done clear
  C)
  Bioenergetic approach done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer15)
  Detritus food chain starts from
  A)
  Dead organic matter done clear
  B)
  Green plants done clear
  C)
  Zooplanktons done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer16)
  In ecological crisis, whom interference play important role
  A)
  Green plants done clear
  B)
  Human done clear
  C)
  Biotic and abiotic components done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer17)
  Whale is
  A)
  Primary producer done clear
  B)
  Carnivorous secondary consumer done clear
  C)
  A decomposer done clear
  D)
  Herbivorous done clear
  View Solution play_arrow

• question_answer18)
    The above represents
  A)
  Food chain done clear
  B)
  Food web done clear
  C)
  A population done clear
  D)
  Ecosystem done clear
  View Solution play_arrow

• question_answer19)
  A natural ecosystem
  A)
  Depends on man done clear
  B)
  Depends on plants done clear
  C)
  Depends on animals done clear
  D)
  Is auto-operated done clear
  View Solution play_arrow

• question_answer20)
  Which of the following in an ecosystem exhibits one-way flow rather than cyclic flow
  A)
  Potassium done clear
  B)
  Carbon done clear
  C)
  Free energy done clear
  D)
  Nitrogen done clear
  View Solution play_arrow

• question_answer21)
  Dynamic aspect of an ecosystem is
  A)
  Producer and energy flow done clear
  B)
  Producer and mineral cycles done clear
  C)
  Consumer and mineral cycles done clear
  D)
  Energy flow and mineral cycles done clear
  View Solution play_arrow

• question_answer22)
  Which of the following is a man made artificial ecosystem
  A)
  Grassland ecosystem done clear
  B)
  Agro-ecosystem done clear
  C)
  Ecosystem of artificial lakes and dams done clear
  D)
  Forest ecosystem done clear
  View Solution play_arrow

• question_answer23)
  Most important determinant of marine ecosystem is
  A)
  Rainfall done clear
  B)
  Geographical location done clear
  C)
  Depth or distance from the shore done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer24)
  Plankton, nekton and benthos are not the components of
  A)
  River ecosystem done clear
  B)
  Oceanic ecosystem done clear
  C)
  Savannah ecosystem done clear
  D)
  Lake ecosystem done clear
  View Solution play_arrow

• question_answer25)
  In lake ecosystem the population rise or its explosion is termed
  A)
  Tide done clear
  B)
  Bloom done clear
  C)
  Plankton done clear
  D)
  Nekton done clear
  View Solution play_arrow

• question_answer26)
  Micro-consumers are
  A)
  Primary consumers done clear
  B)
  Secondary consumers done clear
  C)
  Tertiary consumers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer27)
  The trophic level of Cuscuta, Orobanche and Albugo is
  A)
  Decomposer done clear
  B)
  Primary producer done clear
  C)
  Primary consumer done clear
  D)
  Secondary consumer done clear
  View Solution play_arrow

• question_answer28)
  The trophic level of mushroom and Monotropa is
  A)
  Producer done clear
  B)
  Primary consumer done clear
  C)
  Secondary consumer done clear
  D)
  Decomposer done clear
  View Solution play_arrow

• question_answer29)
  The trophic level of S-bacteria and cyanobacteria is
  A)
  Producer done clear
  B)
  Consumer done clear
  C)
  Saprotrophic decomposer done clear
  D)
  Phagotroph done clear
  View Solution play_arrow

• question_answer30)
  If plant (producers) of an ecosystem die, then the system
  A)
  Cannot produce food done clear
  B)
  Is seriously affected done clear
  C)
  Can have more producers done clear
  D)
  Is not much affected done clear
  View Solution play_arrow

• question_answer31)
  The order of organism in an aquatic food chain is
  A)
  Bacteria ® Seal ® Diatom ® Fish ® Crustacea done clear
  B)
  Crustacea ® Seal ® Fish ® Polar Bear ® Diatom done clear
  C)
  Polar Bear ® Diatom ® Seal ® Crustacea done clear
  D)
  Diatom ® Crustacea ® Fish ® Seal ® Bacteria done clear
  View Solution play_arrow

• question_answer32)
  An ecosystem resists change because it is in a state of
  A)
  Homoeostasis done clear
  B)
  Regular illumination done clear
  C)
  Static imbalance done clear
  D)
  Food accumulation done clear
  View Solution play_arrow

• question_answer33)
  In an ecosystem, there are more prey than predators. This relationship is called
  A)
  Food webs done clear
  B)
  Predator-prey relationship done clear
  C)
  Pyramid of number done clear
  D)
  Succession done clear
  View Solution play_arrow

• question_answer34)
  Pyramid of number becomes partly inverted partly erect for
  A)
  Aquatic ecosystem done clear
  B)
  Terrestrial ecosystem done clear
  C)
  Tree ecosystem done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer35)
  Idea of productivity of an ecosystem can be had from
  A)
  Pyramid of number done clear
  B)
  Pyramid of biomass done clear
  C)
  Height of the plant done clear
  D)
  Development of foliage done clear
  View Solution play_arrow

• question_answer36)
  The pyramid of biomass and the pyramid of number represent
  A)
  The rate of energy flow done clear
  B)
  The rate of food production done clear
  C)
  Standing crop done clear
  D)
  Relationship among organisms done clear
  View Solution play_arrow

• question_answer37)
  The pyramid of energy is the best representation of an ecosystem because it indicates
  A)
  Relation of all plants and animals done clear
  B)
  Total energy present in an ecosystem done clear
  C)
  The rate of food flow through the food chain done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer38)
  Under what condition, the upright pyramid of biomass becomes inverted
  A)
  Grassland ecosystem done clear
  B)
  Terrestrial ecosyslem done clear
  C)
  Pond ecosystem done clear
  D)
  Tree ecosystem done clear
  View Solution play_arrow

• question_answer39)
  The storage of organic matter not used by heterotrophs is termed as
  A)
  Gross primary production done clear
  B)
  Net secondary production done clear
  C)
  Net production done clear
  D)
  Secondary production done clear
  View Solution play_arrow

• question_answer40)
  In an ecosystem, the largest population is of
  A)
  Producers done clear
  B)
  Consumers done clear
  C)
  Decomposers done clear
  D)
  Omnivores done clear
  View Solution play_arrow

• question_answer41)
  Transfer of material and energy from one ecosystem to other ecosystem is best examplified by
  A)
  Harvesting of fishes done clear
  B)
  Grazing of pastureland done clear
  C)
  Game hunting in Savannah done clear
  D)
  Silvicultural practices in a woodland done clear
  View Solution play_arrow

• question_answer42)
  Which of the following has the greatest amount of energy
  A)
  Insectivores done clear
  B)
  Carnivores done clear
  C)
  Herbivores done clear
  D)
  Autotrophs done clear
  View Solution play_arrow

• question_answer43)
  Herbivores are called
  A)
  Primary consumers done clear
  B)
  Secondary producers done clear
  C)
  Key industry animals done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer44)
  Osmotrophs are also called as
  A)
  Producers done clear
  B)
  Consumers done clear
  C)
  Autotrophs done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer45)
  The total rate of photosynthesis including the organic matter used up in respiration during definite period is known as
  A)
  Gross primary productivity done clear
  B)
  Net primary productivity done clear
  C)
  Secondary productivity done clear
  D)
  None of above done clear
  View Solution play_arrow

• question_answer46)
  Which one of the following system constitutes the primary producers
  A)
  Higher plants done clear
  B)
  Algal phytoplanktons done clear
  C)
  Bryophytes done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer47)
  Which one of the following ecosystems is more productive in terms of carbon dioxide fixation
  A)
  Crop ecosystem done clear
  B)
  Forest ecosystem done clear
  C)
  Aquatic ecosystem done clear
  D)
  Hot spring ecosystem done clear
  View Solution play_arrow

• question_answer48)
  The second order consumer in a food chain is
  A)
  Cattle done clear
  B)
  Deer done clear
  C)
  Tiger done clear
  D)
  Goat done clear
  View Solution play_arrow

• question_answer49)
  In an ecosystem energy flows in
  A)
  One direction done clear
  B)
  Two direction done clear
  C)
  Four direction done clear
  D)
  All directions done clear
  View Solution play_arrow

• question_answer50)
  The planktonic forms are
  A)
  Autotrophs done clear
  B)
  Heterotrophs done clear
  C)
  Chemotrophs done clear
  D)
  Insectivorous types done clear
  View Solution play_arrow

• question_answer51)
  Which one of the following contains very low concentrations of dissolved inorganic nutrients  for algal growth
  A)
  Oligotrophic lake done clear
  B)
  Eutrophic lake done clear
  C)
  Mesotrophic lake done clear
  D)
  Both eutrophic and mesotrophic lakes done clear
  View Solution play_arrow

• question_answer52)
  Standing state of the ecosystem is
  A)
  Living and non-living components done clear
  B)
  Only living components done clear
  C)
  Total weight of non-living components done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer53)
  Which ecosystem does not show variations dependent upon geographic location and rainfall
  A)
  Marine ecosystem done clear
  B)
  Fresh water ecosystem done clear
  C)
  Desert ecosystem done clear
  D)
  Tropical ecosystem done clear
  View Solution play_arrow

• question_answer54)
  In food web hyaenas and vultures are
  A)
  Primary consumers done clear
  B)
  Predators done clear
  C)
  Scavengers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer55)
  If all the plants of the world die all the animals will also die due to shortage of [CPMT 1975, 78; AFMC 1989]
  A)
  Cold air done clear
  B)
  Oxygen done clear
  C)
  Food done clear
  D)
  Timber done clear
  View Solution play_arrow

• question_answer56)
  Maximum solar energy may be trapped by [BHU 1978]
  A)
  Growing grasses done clear
  B)
  Planting trees done clear
  C)
  Growing algae in large water bodies done clear
  D)
  More cultivation of crop plants done clear
  View Solution play_arrow

• question_answer57)
  A wolf has just eaten a lamb when tiger saw the wolf attacked it and consumed it. The tiger is in ecological terms [CPMT 1982]
  A)
  A producer done clear
  B)
  A primary consumer done clear
  C)
  A secondary consumer done clear
  D)
  A tertiary consumer done clear
  View Solution play_arrow

• question_answer58)
  Green plants constitute [CPMT 1983, 84, 88; MP PMT 1999]
  A)
  First trophic level done clear
  B)
  Second trophic level done clear
  C)
  Third trophic level done clear
  D)
  Complete food chain done clear
  View Solution play_arrow

• question_answer59)
  An ecosystem is a complex interacting system of          [JIPMER 1984; MP PMT 1984; AMU 1987]
  A)
  Individual done clear
  B)
  Population done clear
  C)
  Communities and their physical environment done clear
  D)
  Communities and their soil conditions done clear
  View Solution play_arrow

• question_answer60)
  Eutrophic lakes means [DPMT 1984]
  A)
  Lake poor in nutrients done clear
  B)
  Lake rich in nutrients done clear
  C)
  Lake poor in flora and fauna done clear
  D)
  Lake lacking in water done clear
  View Solution play_arrow

• question_answer61)
  First link in any food chain is a green plant because [RPMT 1985; CPMT 1985]
  A)
  Green plants can synthesize food done clear
  B)
  They can eat everything done clear
  C)
  Fixed at one place done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer62)
  The number of primary producer within a specified area would be maximum in [RPMT 1985; CPMT 1976; MP PMT 1995]
  A)
  Pond ecosystem done clear
  B)
  Grassland done clear
  C)
  Desert done clear
  D)
  Forest ecosystem done clear
  View Solution play_arrow

• question_answer63)
  Nepenthes is a [CPMT 1986, 90, 93; MP PMT 1995; BVP 2002]
  A)
  Primary producer done clear
  B)
  Consumer done clear
  C)
  Primary producer and consumer done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer64)
  Which one of the following components of ecosystem comes from outside [MP PMT 1987]
  A)
  Oxygen done clear
  B)
  Temperature done clear
  C)
  Insects done clear
  D)
  Energy done clear
  View Solution play_arrow

• question_answer65)
  An ecosystem resist change because it is in a state of [MP PMT 1987]
  A)
  Imbalance done clear
  B)
  Homeostasis done clear
  C)
  Shortage of components done clear
  D)
  Deficiency of light done clear
  View Solution play_arrow

• question_answer66)
  In an ecosystem, the population of [CBSE PMT 1988]
  A)
  Primary producers are more than that of primary consumers done clear
  B)
  Secondary consumers are largest because they are powerful done clear
  C)
  Primary consumers out number primary producers done clear
  D)
  Primary consumers are least dependent upon primary producers done clear
  View Solution play_arrow

• question_answer67)
  On the global basis the maximum productivity is shown by [MP PMT 1988; CPMT 2000]
  A)
  Aquatic ecosystem done clear
  B)
  Grasslands done clear
  C)
  Forests done clear
  D)
  Deserts done clear
  View Solution play_arrow

• question_answer68)
  Which of the following acts as 'nature's scavengers' [CBSE PMT 1997]
  A)
  Man done clear
  B)
  Animals done clear
  C)
  Insects done clear
  D)
  Micro-organisms done clear
  View Solution play_arrow

• question_answer69)
  The pyramid of number in a grassland ecosystem is [MP PMT 1998; BHU 2002]
  A)
  Always erect done clear
  B)
  Always inverted done clear
  C)
  Either erect or inverted done clear
  D)
  Irregular done clear
  View Solution play_arrow

• question_answer70)
  Cyberviatic is associated with [Pb. PMT 1999; RPMT 1999]
  A)
  Flow of energy done clear
  B)
  Cycle of energy done clear
  C)
  Energy released done clear
  D)
  Study of energy done clear
  View Solution play_arrow

• question_answer71)
  Which is the correct sequence in the food chain in a grassland [MP PMT 1990; AFMC 1999; Pb. PMT 2004; HP PMT 2005]
  A)
  Grass ® wolf ® deer ® buffalo done clear
  B)
  Bacteria ® grass ® rabbit ® wolf done clear
  C)
  Grass ® insect ® birds ® snakes done clear
  D)
  Grass ® snake ® insect ® deer done clear
  View Solution play_arrow

• question_answer72)
  Generally the food chain has how many trophic levels [MP PMT 1990, 2001, 02; BHU 2001]
  A)
  One done clear
  B)
  Two done clear
  C)
  Three or Four done clear
  D)
  Three done clear
  View Solution play_arrow

• question_answer73)
  In an ecosystem which of the following are important components [MP PMT 1992]
  A)
  Energy flow and food chain done clear
  B)
  Mineral recycling and energy flow done clear
  C)
  Food chain and decomposers done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer74)
  Among the following, what happens in abiotic components of an ecosystem [CPMT 1990]
  A)
  Flow of energy done clear
  B)
  Cycling of materials done clear
  C)
  Consumer done clear
  D)
  Flow of energy and cycling of material done clear
  View Solution play_arrow

• question_answer75)
  The maximum biological magnification of DDT through food web is seen in [MP PMT 1992]
  A)
  Algae done clear
  B)
  Bacteria done clear
  C)
  Higher plants done clear
  D)
  Man done clear
  View Solution play_arrow

• question_answer76)
  The pyramid that cannot be inverted in a stable ecosystem, is pyramid of [CPMT 1991, 99, 2001, 02; MP PMT 2001, 02; KCET 2000; HP PMT 2005; Orissa JEE 2005]
  A)
  Number done clear
  B)
  Energy done clear
  C)
  Biomass done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer77)
  Snake generally belongs to [CPMT 1991]
  A)
  Saprophytes done clear
  B)
  Primary consumer done clear
  C)
  Second trophic level done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer78)
  In an ecosystem decomposer include [CPMT 1991]
  A)
  Bacteria and fungi done clear
  B)
  Only microscopic organisms done clear
  C)
  Above two done clear
  D)
  Above two plus macro-organisms done clear
  View Solution play_arrow

• question_answer79)
  Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by [CPMT 1991; MP PMT 1999]
  A)
  First law of thermodynamics done clear
  B)
  Second law of thermodynamics done clear
  C)
  Both of these done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer80)
  Driving force of an ecosystem is [CPMT 1991]
  A)
  Producer done clear
  B)
  Carbohydrates in plants done clear
  C)
  Biomass done clear
  D)
  Solar energy done clear
  View Solution play_arrow

• question_answer81)
  The total energy fixed by a gram plant (Cicer arietinum) in an ecosystem on the whole is called [CPMT 1991]
  A)
  Primary production done clear
  B)
  Gross production done clear
  C)
  Secondary production done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer82)
  Which of the following is correct sequence in food chain [CBSE PMT 1991]
  A)
  Fallen leaves ® bacteria ® insect larvae ® birds done clear
  B)
  Phytoplankton ® zooplankton ® fish done clear
  C)
  Grasses ® fox ® rabbit done clear
  D)
  Grasses ® chameleon ® insects ® birds done clear
  View Solution play_arrow

• question_answer83)
  The transfer of energy from organism to organism in a natural community establishes [CPMT 1988]
  A)
  Food chains done clear
  B)
  Biological control done clear
  C)
  Natural barriers done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer84)
  With regard to ecological food chain, man is a [CPMT 1980]
  A)
  Producer done clear
  B)
  Consumer done clear
  C)
  Both producer and consumer done clear
  D)
  Producer and decomposer done clear
  View Solution play_arrow

• question_answer85)
  If phytoplankton are destroyed in the sea, then [DPMT 1984]
  A)
  Algae will get more space to grow done clear
  B)
  Primary consumers will grow luxuriently done clear
  C)
  It will affect the food chain done clear
  D)
  No effect will be seen done clear
  View Solution play_arrow

• question_answer86)
  An ecosystem must have continuous external source of [NCERT 1982]
  A)
  Food done clear
  B)
  Minerals done clear
  C)
  Energy done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer87)
  The word ??ecosystem?? was first coined by           [CPMT 1989, 2002; 1995; MP PMT 1997, 2001; BHU 2002]
  A)
  Weaver and Clements done clear
  B)
  A.G. Tansley done clear
  C)
  E.P. Odum done clear
  D)
  By all the above done clear
  View Solution play_arrow

• question_answer88)
  Trophic levels are formed by [CPMT 1980, 2000; BHU 1984]
  A)
  Organisms linked in food chain done clear
  B)
  Only plants done clear
  C)
  Only animals done clear
  D)
  Only carnivores done clear
  View Solution play_arrow

• question_answer89)
  In a food chain herbivores are [CPMT 1984; MHCET 2001; BVP 2001]
  A)
  Primary producers done clear
  B)
  Primary consumers done clear
  C)
  Secondary consumers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer90)
  In a food chain of grassland ecosystem, the top consumers are [NCERT 1979]
  A)
  Carnivores done clear
  B)
  Herbivores done clear
  C)
  Either carnivores or herbivores done clear
  D)
  Bacteria done clear
  View Solution play_arrow

• question_answer91)
  Biological equilibrium is an equilibrium among the [CPMT 1981, 84, 85;MP PMT 1984]
  A)
  Producers done clear
  B)
  Producers and consumers done clear
  C)
  Decomposers and producers done clear
  D)
  Producers, consumers and decomposers done clear
  View Solution play_arrow

• question_answer92)
  In a tree ecosystem, the pyramid of number is [CPMT 1983; RPMT 1997]
  A)
  Upright done clear
  B)
  Inverted done clear
  C)
  Both of the above done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer93)
  Largest ecosystem of the world are [AIIMS 1985; MHCET 2000]
  A)
  Grasslands done clear
  B)
  Great lakes done clear
  C)
  Oceans done clear
  D)
  Forests done clear
  View Solution play_arrow

• question_answer94)
  Energy storage at consumer level is called [MP PMT 1990; 2001]
  A)
  Gross primary productivity done clear
  B)
  Secondary productivity done clear
  C)
  Net primary productivity done clear
  D)
  Net productivity done clear
  View Solution play_arrow

• question_answer95)
  Ecosystem is [CPMT 1991; MP PMT 2002; Orissa JEE 2005]
  A)
  Open done clear
  B)
  Closed done clear
  C)
  Both open and close done clear
  D)
    Neither open nor closed done clear
  View Solution play_arrow

• question_answer96)
  What is maximum in a pond-ecosystem [RPMT 1992]
  A)
  Primary consumers done clear
  B)
  Secondary consumers done clear
  C)
  Producers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer97)
  The pyramid of number is based on [CBSE PMT 1993]
  A)
  Unit per area done clear
  B)
  Food per individual done clear
  C)
  Individuals in trophic level done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer98)
  If the plant producer dies in the ecosystem, then the system is [DPMT 1992]
  A)
  Seriously affected done clear
  B)
  Cannot produce food done clear
  C)
  Can have more producers done clear
  D)
  Hardly affected done clear
  View Solution play_arrow

• question_answer99)
  The phytoplankton in the ponds act as [DPMT 1992]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Consumers done clear
  D)
  Organic compounds done clear
  View Solution play_arrow

• question_answer100)
  The character of an ecosystem is determined by the environmental factor which is shortest supply. This is the [CBSE PMT 1994]
  A)
  Law of minimum done clear
  B)
  Law of diminishing returns done clear
  C)
  Law of limiting factors done clear
  D)
  Law of supply and demand done clear
  View Solution play_arrow

• question_answer101)
  Which must be preserved in an ecosystem, if the system is to be maintained [JIPMER 1994; Kerala PMT 2004]
  A)
  Producers and carnivores done clear
  B)
  Producers and decomposers done clear
  C)
  Carnivores and decomposers done clear
  D)
  Herbivores and carnivores done clear
  View Solution play_arrow

• question_answer102)
  The importance of ecosystem lies in [MP PMT 1993, 95, 98]
  A)
  Cycling of materials done clear
  B)
  Flow of energy done clear
  C)
  Both the above done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer103)
  Ecosystem has two components [MP PMT 1993, 98, 99; BHU 2000]
  A)
  Plants and animals done clear
  B)
  Weeds and trees done clear
  C)
  Biotic and abiotic done clear
  D)
  Frog and men done clear
  View Solution play_arrow

• question_answer104)
  Ecosystem creates [MP PMT 1993]
  A)
  Food chain done clear
  B)
  Food web done clear
  C)
  Both the above done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer105)
  In lake ecosystem, pyramid biomass is [MP PMT 1993; Bihar 2005]
  A)
  Upright done clear
  B)
  Inverted done clear
  C)
  Anything is possible done clear
  D)
  None is correct done clear
  View Solution play_arrow

• question_answer106)
  In forest ecosystem, pyramid of number is [MP PMT 1993]
  A)
  Upright done clear
  B)
  Inverted done clear
  C)
  Any of the two done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer107)
  Carnivores are [MP PMT 1993]
  A)
  Usually primary consumers done clear
  B)
  Usually secondary consumers done clear
  C)
  Usually secondary or tertiary consumers done clear
  D)
  Usually decomposers rather than consumers done clear
  View Solution play_arrow

• question_answer108)
  The trophic level of lion in a forest  ecosystem is [MP PMT 1994]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer109)
  What energy percentage can be captured by the organisms of next trophic level [CBSE PMT 1999]
  A)
  20% done clear
  B)
  30% done clear
  C)
  90% done clear
  D)
  10% done clear
  View Solution play_arrow

• question_answer110)
  In a pond if there is too much wastage, then the BOD of pond will [CPMT 1994]
  A)
  Increase done clear
  B)
  Decrease done clear
  C)
  Remain same done clear
  D)
   a and b both done clear
  View Solution play_arrow

• question_answer111)
  Which of the following abundantly occurs in pond ecosystem [RPMT 1995]
  A)
  Producer done clear
  B)
  Consumer done clear
  C)
  Top consumer done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer112)
  If all decomposers are removed from an ecosystem, what will happen [RPMT 1995]
  A)
  All consumers will die done clear
  B)
  Energy cycle will be affected done clear
  C)
  Balance of biogeochemical cycle will be disturbed done clear
  D)
  Only herbivores will die done clear
  View Solution play_arrow

• question_answer113)
  Which of the following is the most stable ecosystem [CBSE PMT 1995; BHU 2002; MP PMT 2000]
  A)
  Mountain done clear
  B)
  Desert done clear
  C)
  Forest done clear
  D)
  Ocean done clear
  View Solution play_arrow

• question_answer114)
  In a biotic community, primary consumers are [CBSE PMT 1995; BVP 2001; MHCET 2001]
  A)
  Omnivores done clear
  B)
  Carnivores done clear
  C)
  Detritivores done clear
  D)
  Herbivores done clear
  View Solution play_arrow

• question_answer115)
  Which of the following does not effect the forest ecosystem [Bihar MDAT 1995]
  A)
  Deforestation done clear
  B)
  Soil erosion done clear
  C)
  Climatic variation done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer116)
  The pyramid of energy in a forest ecosystem is [MP PMT 1994, 95, 97, 2002]
  A)
  Always upright done clear
  B)
  Always inverted done clear
  C)
  Both upright and inverted done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer117)
  In an ecosystem, there is flow of energy at different trophic levels. This is as follows : [KCET 1994]
  A)
  Primary consumers - Tertiary consumers - Secondary consumers - Decomposers - Producers done clear
  B)
  Producers - Primary consumers - Secondary consumers - Tertiary consumers - Decomposers done clear
  C)
  Producers - Decomposers - Primary consumers - Tertiary consumers - Secondary consumers done clear
  D)
  Producers - Primary consumers - Tertiary consumers - Secondary consumers - Decomposers done clear
  View Solution play_arrow

• question_answer118)
  We refer to the following as the food chain [KCET 1994]
  A)
  Large number of animals near a source of food done clear
  B)
  Transfer of food energy from the green plants through a series of consumer organisms done clear
  C)
  Large number of human beings forming a human chain near a source of food done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer119)
  In a food chain, lion is a [EAMCET 1995; MHCET 2003]
  A)
  Secondary consumer done clear
  B)
  Primary consumer done clear
  C)
  Tertiary consumer done clear
  D)
  Secondary producer done clear
  View Solution play_arrow

• question_answer120)
  In a pond ecosystem, benthos means    [EAMCET 1995; BHU 2000, 01; AFMC 2001; MHCET 2003]
  A)
  Primary consumers in the depth of a pond done clear
  B)
  Zooplankton on the water surface done clear
  C)
  Periphyton done clear
  D)
  Epineuston done clear
  View Solution play_arrow

• question_answer121)
  Transfer of energy from one trophic level to other trophic level is according to the second law of thermodynamics. The efficiency of energy transfer from herbivorous to carnivorous is [CBSE PMT 1996; AIEEE 2004]
  A)
  25% done clear
  B)
  50% done clear
  C)
  10% done clear
  D)
  5% done clear
  View Solution play_arrow

• question_answer122)
  In a food chain, which of the following produces in the largest amount [CBSE PMT 1996]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Tertiary consumers done clear
  D)
  Primary consumers done clear
  View Solution play_arrow

• question_answer123)
  If forest area is reduced to half, which one of the following will be a long term effect [CBSE PMT 1996]
  A)
  The natives (tribals) of that area will die on account of hunger done clear
  B)
  Cattles of that area will die due to scarcity of fodder done clear
  C)
  To diversity in germplasm will effect the crop breeding done clear
  D)
  It will be converted into large desert done clear
  View Solution play_arrow

• question_answer124)
  The first link in any food chain is always a green plant because [MP PMT 1996, 99]
  A)
  They are widely distributed done clear
  B)
  They are firmly fixed to the soil done clear
  C)
  They alone have a capacity to fix atmospheric  in the presence of sunlight done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer125)
  Food levels in an ecosystem are called [MP PMT 1996]
  A)
  Trophic levels done clear
  B)
  Consumer levels done clear
  C)
  Producer levels done clear
  D)
  Herbivore levels done clear
  View Solution play_arrow

• question_answer126)
  Which one of the following is a correct food chain [MP PMT 1996]
  A)
  Grasshopper ® Grass ® Snake ® Frog ® Eagle done clear
  B)
  Grass ® Grasshopper ® Frog ® Snake ® Eagle done clear
  C)
  Eagle ® Snake ® Grasshopper ® Grass ® Frog done clear
  D)
  Frog ® Snake ® Eagle ® Grasshopper ® Grass done clear
  View Solution play_arrow

• question_answer127)
  The correct path of energy flow in an ecosystem is [MP PMT 1995, 2002]
  A)
  Producers ® Carnivores ® Herbivores ® Decomposers done clear
  B)
  Producers ® Herbivores ® Carnivores ® Decomposers done clear
  C)
  Herbivores ® Carnivores ® Producers ® Decomposers done clear
  D)
  Herbivores ® Producers ® Carnivores ® Decomposers done clear
  View Solution play_arrow

• question_answer128)
  Which of the following ecosystem has the highest gross primary productivity [CBSE PMT 1997, 2004]
  A)
  Grassland done clear
  B)
  Coral reef done clear
  C)
  Mangroves done clear
  D)
  Rain forest done clear
  View Solution play_arrow

• question_answer129)
  Biological equilibrium is found among the [MP PMT 1998; MHCET 2003]
  A)
  Producer plants done clear
  B)
  Consumers and producers done clear
  C)
  Decomposers done clear
  D)
  Producers, consumers and decomposers done clear
  View Solution play_arrow

• question_answer130)
  The food chain in which microbes split energy rich compounds of the producer community is [AIIMS 1999]
  A)
  Parasitic food chain done clear
  B)
  Detritus food chain done clear
  C)
  Predators food chain done clear
  D)
  Producer food chain done clear
  View Solution play_arrow

• question_answer131)
  In an ecosystem  bacteria are considered as [MP PMT 1997]
  A)
  Microconsumers done clear
  B)
  Macroconsumers done clear
  C)
  Primary consumers done clear
  D)
  Secondary consumers done clear
  View Solution play_arrow

• question_answer132)
  A lake ecosystem is [MP PMT 1997]
  A)
  Artificial done clear
  B)
  Abiotic done clear
  C)
  Natural done clear
  D)
  Hydrological done clear
  View Solution play_arrow

• question_answer133)
  Ecological pyramids are of [MP PMT 1997]
  A)
  Two types done clear
  B)
  Three types done clear
  C)
  Four types done clear
  D)
  Five types done clear
  View Solution play_arrow

• question_answer134)
  To eat and be eaten relationship is called as [RPMT 1997]
  A)
  Food chain done clear
  B)
  Food web done clear
  C)
  Symbiosis done clear
  D)
  Phagocytosis done clear
  View Solution play_arrow

• question_answer135)
  Which of the following ecosystems would be most stable [RPMT 1997]
  A)
  Man made forest done clear
  B)
  Fresh water lake done clear
  C)
  Saline lake done clear
  D)
  Natural forest done clear
  View Solution play_arrow

• question_answer136)
  The living organisms of all ecosystems collectively  consitute [RPMT 1997]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Consumers done clear
  D)
  Biosphere done clear
  View Solution play_arrow

• question_answer137)
  The number of individuals of a species in a particular ecosystem at a given time remains constant due to [MP PMT 1998]
  A)
  Man done clear
  B)
  Parasites done clear
  C)
  Predators done clear
  D)
  Available food done clear
  View Solution play_arrow

• question_answer138)
  Ecosystem may be defined as [MP PMT 1999]
  A)
  Group of plants which act as the energy suppliers done clear
  B)
  Group of organisms which form population done clear
  C)
  Functional unit for ecological studies done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer139)
  Which of the following habitats is most unsuitable for primary productivity [MP PMT 1999]
  A)
  Meadow done clear
  B)
  Forested river bank done clear
  C)
  Cave done clear
  D)
  Pond done clear
  View Solution play_arrow

• question_answer140)
  In an ecosystem in abiotic components which of the following occur [MP PMT 1999]
  A)
  Flow of energy done clear
  B)
  Cycling of materials done clear
  C)
  Consumers done clear
  D)
  Flow of energy and cycling of materials done clear
  View Solution play_arrow

• question_answer141)
  The transfer or energy from organisms to organisms in a natural community establishes [MP PMT 1999]
  A)
  Food chains done clear
  B)
  Biological control done clear
  C)
  Natural barriers done clear
  D)
  All the above done clear
  View Solution play_arrow

• question_answer142)
  The snakes are included under [MP PMT 1999]
  A)
  Saprophytes done clear
  B)
  Primary consumers done clear
  C)
  Second trophic level done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer143)
  The zooplanktonic forms are [MP PMT 1999]
  A)
  Primary consumers done clear
  B)
  Secondary consumers done clear
  C)
  Carnivores done clear
  D)
  Primary producers done clear
  View Solution play_arrow

• question_answer144)
  Energy transfer from one trophic level to other, in a food chain is [CBSE PMT 1999; BHU 2005]
  A)
  1% done clear
  B)
  2% done clear
  C)
  10% done clear
  D)
  20% done clear
  View Solution play_arrow

• question_answer145)
  The maximum biomagnification would be in which of the following in case of aquatic ecosystem [CBSE PMT 1999]
  A)
  Fishes done clear
  B)
  Birds done clear
  C)
  Zooplanktons done clear
  D)
  Phytoplanktons done clear
  View Solution play_arrow

• question_answer146)
  The green plants are removed from an aquarium [KCET 1998]
  A)
  The fishes will not survive done clear
  B)
  Fishes will increase in size done clear
  C)
  Fishes will decrease in size done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer147)
  Energy enters in ecosystem through [CPMT 1998]
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Producers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer148)
  Ecosystem is defined as [CPMT 1998]
  A)
  Relation between plants and animals done clear
  B)
  Relation between biotic and physical components done clear
  C)
  Relation between producers and decomposers done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer149)
  Decomposers are [CPMT 1998; BHU 2001]
  A)
  Autotrophs done clear
  B)
  Heterotrophs done clear
  C)
  Autoheterotrophs done clear
  D)
  Organotrophs done clear
  View Solution play_arrow

• question_answer150)
  In a terrestial ecosystem such as forest, maximum energy is in which trophic level [CBSE PMT 1998]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer151)
  The rate at which light energy is converted into chemical energy of organic molecules is the ecosystem's [CBSE PMT 1998; BHU 1999; Kerala CET 2003]
  A)
  Net primary productivity done clear
  B)
  Gross secondary productivity done clear
  C)
  Net secondary productivity done clear
  D)
  Gross primary productivity done clear
  View Solution play_arrow

• question_answer152)
  The relationship in an ecosystem can be depicted in [AIIMS 1998]
  A)
  Pyramid of energy done clear
  B)
  Pyramid of biomass done clear
  C)
  Pyramid of numbers done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer153)
  Biomass pyramid of forest is [Pb. PMT 1999; RPMT 1999]
  A)
  Inverted done clear
  B)
  Upright done clear
  C)
  Infinite done clear
  D)
  Finite done clear
  View Solution play_arrow

• question_answer154)
  In an aquatic ecosystem, maximum biomagnification is seen among the [CBSE PMT 1999]
  A)
  Fishes done clear
  B)
  Phytoplanktons done clear
  C)
  Zooplanktons done clear
  D)
  Macroscopic plant done clear
  View Solution play_arrow

• question_answer155)
  The dominant second trophic level, in a lake ecosystem, is [BHU 1999]
  A)
  Benthos done clear
  B)
  Plankton done clear
  C)
  Zooplankton done clear
  D)
  Phytoplankton done clear
  View Solution play_arrow

• question_answer156)
  A rat feeding upon potato tuber is [KCET 1999]
  A)
  Producer done clear
  B)
  Carnivore done clear
  C)
  Decomposer done clear
  D)
  Primary consumer done clear
  View Solution play_arrow

• question_answer157)
  Tip of ecological pyramid is occupied by [MP PMT 1999; CBSE PMT 2001]
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Producers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer158)
  The lentic ecosystem includes which of following water  [KCET 2000]
  A)
  Rain done clear
  B)
  Running done clear
  C)
  Standing done clear
  D)
  Gravitational done clear
  View Solution play_arrow

• question_answer159)
  Which of the following is source of energy to an ecosystem [MP PMT 2000]
  A)
  Solar energy done clear
  B)
  Sugar stored done clear
  C)
  Heat liberated during respiration done clear
  D)
  ATP done clear
  View Solution play_arrow

• question_answer160)
  Food chain consists of [MP PMT 2000, 03]
  A)
  Producer, consumer and decomposer done clear
  B)
  Producer, carnivore and decomposer done clear
  C)
  Producer and primary consumer done clear
  D)
  Producer, herbivore and carnivore done clear
  View Solution play_arrow

• question_answer161)
  Animals which live at the bottom of sea are [BVP 2000]
  A)
  Nekton done clear
  B)
  Diatom done clear
  C)
  Banthos done clear
  D)
  Plankton done clear
  View Solution play_arrow

• question_answer162)
  Green plants are [BVP 2000]
  A)
  Autotrophs done clear
  B)
  Heterotrophs done clear
  C)
  Chemotrophs done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer163)
  Pyramid of energy is [BVP 2000]
  A)
  Upright done clear
  B)
  Inverted done clear
  C)
  Oblique done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer164)
  The flora and fauna in lakes or ponds are [AIIMS 2000]
  A)
  Lentic biota done clear
  B)
  Lotic biota done clear
  C)
  Abiotic biota done clear
  D)
  Field layer done clear
  View Solution play_arrow

• question_answer165)
  During food chain the maximum energy is stored in [MHCET 2001; Pb. PMT 2004]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Herbivores done clear
  D)
  Carnivores done clear
  View Solution play_arrow

• question_answer166)
  Transition zone between two ecosystems or vegetational regions is termed [HP PMT 2005; Kerala CET 2005]
  A)
  Ecocline done clear
  B)
  Ecotone done clear
  C)
  Ecad done clear
  D)
  Barrier done clear
  View Solution play_arrow

• question_answer167)
  The ecosystem consists of [AIIMS 2001; BVP 2001]
  A)
  Producers done clear
  B)
  Consumers done clear
  C)
  Decomposers done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer168)
  In a food chain, the total amount of living material is depicted by [BHU 2001]
  A)
  Pyramid of energy done clear
  B)
  Pyramid of numbers done clear
  C)
  Pyramid of biomass done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer169)
  The biotic part of ecosystem includes [BHU 2001]
  A)
  Producers done clear
  B)
  Consumers done clear
  C)
  Decomposers done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer170)
  When the number of organisms at successive levels are plotted, they assume the shape of a pyramid. This is called the pyramid of [CBSE PMT 2001; MHCET 2003]
  A)
  Energy done clear
  B)
  Number done clear
  C)
  Biomass done clear
  D)
  Both a and c done clear
  View Solution play_arrow

• question_answer171)
  The two vegetation of ecosystem are separated by [CPMT 2001]
  A)
  Ecotone done clear
  B)
  Ecoline done clear
  C)
  Ecosystem done clear
  D)
  Ecesis done clear
  View Solution play_arrow

• question_answer172)
  Energy enters into the ecosystem through [CBSE PMT 2001; CPMT 2003]
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Producers done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer173)
  Which of the following is an artificial ecosystem [MP PMT 2001]
  A)
  Rice-field done clear
  B)
  Forest done clear
  C)
  Grassland done clear
  D)
  Lake done clear
  View Solution play_arrow

• question_answer174)
  Which are the biotic components of forest ecosystem [MP PMT 2001]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Consumers done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer175)
  Which of the following is most important abiotic factor in pond ecosystem [MHCET 2001]
  A)
  Water done clear
  B)
  Phytoplankton done clear
  C)
  Zooplankton done clear
  D)
  Temperature done clear
  View Solution play_arrow

• question_answer176)
  The bacteria that attack dead organic matter are [MHCET 2001]
  A)
  Producer done clear
  B)
  Herbivore done clear
  C)
  Carnivores done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer177)
  10% law of flow of energy in ecosystem was proposed by [MHCET 2001]
  A)
  Lindemann done clear
  B)
  Carl Mobius done clear
  C)
  Tensely done clear
  D)
  Darwin done clear
  View Solution play_arrow

• question_answer178)
  A plant being eaten by a herbivorous which in turn is eaten by a carnivorous makes [CBSE PMT 2002]
  A)
  Food chain done clear
  B)
  Food web done clear
  C)
  Omnivorous done clear
  D)
  Interdependent done clear
  View Solution play_arrow

• question_answer179)
  When peacock eats snakes which eat insects thriving on green plants, the peacock is [CPMT 2002]
  A)
  A primary consumer done clear
  B)
  A primary decomposer done clear
  C)
  Final decomposer done clear
  D)
  The apex of food pyramid done clear
  View Solution play_arrow

• question_answer180)
  A pond is a [RPMT 2002; MHCET 2003]
  A)
  Biome done clear
  B)
  Natural ecosystem done clear
  C)
  Artificial ecosystem done clear
  D)
  Community of plants and animals done clear
  View Solution play_arrow

• question_answer181)
  Source of energy in an ecosystem is [CPMT 2002]
  A)
  Sun done clear
  B)
  ATP done clear
  C)
  Sugar made by plants done clear
  D)
  Green plant done clear
  View Solution play_arrow

• question_answer182)
  Maximum biomass and variable organism are found in [Orissa PMT 2002]
  A)
  River done clear
  B)
  Pond done clear
  C)
  Lake done clear
  D)
  Estuary done clear
  View Solution play_arrow

• question_answer183)
  In food chain initial organisms are [MP PMT 2002]
  A)
  Top consumers done clear
  B)
  Secondary consumers done clear
  C)
  Primary consumers done clear
  D)
  Photosynthates done clear
  View Solution play_arrow

• question_answer184)
  In a food web, each successive trophic  level has [BHU 2002]
  A)
  Increased total energy done clear
  B)
  Less total energy content done clear
  C)
  More total energy content done clear
  D)
  Non estimated energy content done clear
  View Solution play_arrow

• question_answer185)
  Which of the following food chain may not be directly dependent upon solar energy [CBSE PMT 2002]
  A)
  Grazing done clear
  B)
  Detritus done clear
  C)
  Soaking done clear
  D)
  Depleting done clear
  View Solution play_arrow

• question_answer186)
  A food chain starts with [BVP 2002; MP PMT 2004]
  A)
  Nitrogen fixing organisms done clear
  B)
  Photosynthesis done clear
  C)
  Respiration done clear
  D)
  Decomposers done clear
  View Solution play_arrow

• question_answer187)
  If bamboo plant is growing in a far forest then what will be its trophic level [CBSE PMT 2002]
  A)
  First done clear
  B)
  Second done clear
  C)
  Third done clear
  D)
  Fourth done clear
  View Solution play_arrow

• question_answer188)
  In forest ecosystem, fungi is grouped as [CPMT 2003]
  A)
  Producer done clear
  B)
  Consumer done clear
  C)
  Secondary consumer done clear
  D)
  Decomposer done clear
  View Solution play_arrow

• question_answer189)
  Which ecosystem shows maximum genetic diversity [AIEEE 2003]
  A)
  Coniferous forests done clear
  B)
  Tropical rain forests done clear
  C)
  Subtropical forests done clear
  D)
  Temperate forests done clear
  View Solution play_arrow

• question_answer190)
  When spontaneous process occurs then free energy of system [DPMT 2003]
  A)
  Decrease done clear
  B)
  Increase done clear
  C)
  Remains same done clear
  D)
  Either can increase or decrease done clear
  View Solution play_arrow

• question_answer191)
  The maximum biomass of living diatoms to be found in [AIEEE 2003]
  A)
  Marine pelagic habitats done clear
  B)
  Moist soil and swamps done clear
  C)
  Deep coastmines done clear
  D)
  Salt lakes done clear
  View Solution play_arrow

• question_answer192)
  If decomposers are removed what will happen ecosystem [BHU 2003]
  A)
  Energy cycle is stopped done clear
  B)
  Mineral cycle is stopped done clear
  C)
  Consumers cannot absorb solar energy done clear
  D)
  Rate of decomposition of mineral increases done clear
  View Solution play_arrow

• question_answer193)
  Inverted pyramid is found in [MHCET 2003; Manipal 2005]
  A)
  Biomass pyramid of aquatic system done clear
  B)
  Energy pyramid of grassland done clear
  C)
  Biomass pyramid of grassland done clear
  D)
  Pyramid of number of aquatic system done clear
  View Solution play_arrow

• question_answer194)
  Which of the food chains directly depends on solar radiations [MP PMT 2004]
  A)
  Predator done clear
  B)
  Grazing done clear
  C)
  Detritus done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer195)
  Which of the following organism form the decomposers [BHU 2004]
  A)
  Pteris done clear
  B)
  Bacteria done clear
  C)
  Saprophytic fungi done clear
  D)
  Both b and c done clear
  View Solution play_arrow

• question_answer196)
  Which of the following supports a dense population of plankton and littoral vegetation [BHU 2004]
  A)
  Oligotrophic done clear
  B)
  Eutrophic done clear
  C)
  Lithotrophic done clear
  D)
  Agroecotrophic done clear
  View Solution play_arrow

• question_answer197)
  A man-made ecosystem is [BHU 2004]
  A)
  Less in diversity done clear
  B)
  More in diversity done clear
  C)
  Man does not make ecosystem done clear
  D)
  More stable than natural ecosystem done clear
  View Solution play_arrow

• question_answer198)
  Decomposers are [Pb. PMT 2004]
  A)
  Autotrophs done clear
  B)
  Heterotrophs done clear
  C)
  Organotrophs done clear
  D)
  Autoheterotrophs done clear
  View Solution play_arrow

• question_answer199)
  These belong to the catergory of primary consumers ... [KCET 2004]
  A)
  Snakes and frogs done clear
  B)
  Water insects done clear
  C)
  Eagle and snakes done clear
  D)
  Insects and cattle done clear
  View Solution play_arrow

• question_answer200)
  An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having [CBSE PMT 2004]
  A)
  Low stability and low resilience done clear
  B)
  High stability and high resilience done clear
  C)
  Low stability and high resilience done clear
  D)
  High stability and low resilience done clear
  View Solution play_arrow

• question_answer201)
  Energy flow and energy transformations in living systems strictly conform to the   [Kerala PMT 2004]
  A)
  Law of limiting factors done clear
  B)
  Liebig's law of minimum done clear
  C)
  Laws of thermodynamics done clear
  D)
  Shelford's law of tolerance done clear
  E)
  Biogenetic law done clear
  View Solution play_arrow

• question_answer202)
  Bacteria and fungi in a forest ecosystem are generally [Kerala PMT 2004]
  A)
  Producers done clear
  B)
  Decomposers done clear
  C)
  Primary consumers done clear
  D)
  Secondary consumers done clear
  E)
  Tertiary consumers done clear
  View Solution play_arrow

• question_answer203)
  Area where two ecosystems overlap each other [Kerala PMT 2004]
  A)
  Niche done clear
  B)
  Ecotype done clear
  C)
  Edge line done clear
  D)
  Ecotone done clear
  E)
  Corridor done clear
  View Solution play_arrow

• question_answer204)
  In an ecosystem [AIEEE 2004]
  A)
  Cycling of energy and nutrients is a coupled process done clear
  B)
  Cycling of energy is an independent process done clear
  C)
  Movement of energy is unidirectional done clear
  D)
  Macro and micronutrients cycle at the same pace done clear
  View Solution play_arrow

• question_answer205)
  The Great Barrier Reef along the east coast of Australia can be categorised as [AIIMS 2004]
  A)
  Population done clear
  B)
  Community done clear
  C)
  Ecosystem done clear
  D)
  Biome done clear
  View Solution play_arrow

• question_answer206)
  In a food chain, the total amount of living material is depicted by [Pb. PMT 2004]
  A)
  Pyramid of biomass done clear
  B)
  Pyramid of energy done clear
  C)
  Pyramid of number done clear
  D)
  Trophic levels done clear
  View Solution play_arrow

• question_answer207)
  Given below is one of the types of ecological pyramids This type represents [AIIMS 2005]
  A)
  Pyramid of numbers in a grassland done clear
  B)
  Pyramid of biomass in a fallow land done clear
  C)
  Pyramid of biomass in a lake done clear
  D)
  Energy pyramid in a spring done clear
  View Solution play_arrow