NEET Biology Ecosystem Question Bank

done Self Evaluation Test - Ecosystem Total Questions - 75

• question_answer1)
  The largest ecosystem to the world is:
  A)
  Forests done clear
  B)
  Grasslands done clear
  C)
  Great lakes done clear
  D)
  Oceans done clear
  View Solution play_arrow

• question_answer2)
  The driving force for an ecosystem is:
  A)
  Biomass done clear
  B)
  Producers done clear
  C)
  Carbohydrates in producers done clear
  D)
  Solar energy done clear
  View Solution play_arrow

• question_answer3)
  Which most often limits the primary productivity of the ecosystem?
  A)
  Solar radiation/light done clear
  B)
  Oxygen done clear
  C)
  Consumers done clear
  D)
  Nitrogen done clear
  View Solution play_arrow

• question_answer4)
  Benthos of pond ecosystem are:
  A)
  Producers done clear
  B)
  Primary consumers done clear
  C)
  Secondary consumers done clear
  D)
  Tertiary consumers done clear
  View Solution play_arrow

• question_answer5)
  A recently discovered ecosystem is:
  A)
  Crater done clear
  B)
  Tundra done clear
  C)
  Floating iceberg done clear
  D)
  Vent done clear
  View Solution play_arrow

• question_answer6)
  An incomplete ecosystem is:
  A)
  Grassland done clear
  B)
  River done clear
  C)
  Wetland done clear
  D)
  Cave done clear
  View Solution play_arrow

• question_answer7)
  How much portion of the PAR is captured by the plants?
  A)
  5-10% done clear
  B)
  7-10% done clear
  C)
  8-10% done clear
  D)
  2-10% done clear
  View Solution play_arrow

• question_answer8)
  In terrestrial ecosystem, maximum energy is present in:
  A)
  \[{{T}_{3}}\] done clear
  B)
  \[{{T}_{2}}\] done clear
  C)
  \[{{T}_{1}}\] done clear
  D)
  \[{{T}_{4}}\] done clear
  View Solution play_arrow

• question_answer9)
  Plankton, Nekton and Benthos are not the components of one of ecosystems which is:
  A)
  Oceans done clear
  B)
  Fresh water rivers done clear
  C)
  Grassland done clear
  D)
  Pond or lake done clear
  View Solution play_arrow

• question_answer10)
  Which of the following is the most stable ecosystem?
  A)
  Ocean done clear
  B)
  Desert done clear
  C)
  Forest done clear
  D)
  Mountain done clear
  View Solution play_arrow

• question_answer11)
  The process by which a lake ecosystem is altered by eutrophication involves several stages, each causing the next. Which of the following stages would occur second in the chain of causation?
  A)
  Algal blooms occur. done clear
  B)
  Oxygen levels drop in deeper water. done clear
  C)
  Phosphorus input from sewage and agricultural runoff increases. done clear
  D)
  Respiratory demand from decomposers increases. done clear
  View Solution play_arrow

• question_answer12)
  Phosphorus usually becomes a limiting factor at certain times of the year in:
  A)
  Aquatic ecosystem done clear
  B)
  Grassland ecosystem done clear
  C)
  Forest ecosystem done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer13)
  The pyramid of number in grassland ecosystem is:
  A)
  Linear done clear
  B)
  Inverted done clear
  C)
  Upright done clear
  D)
  Negative done clear
  View Solution play_arrow

• question_answer14)
  A pasture of 40 hectares has a biomass of 40 kg/hectare, or roughly 1,000,000 calories of energy. Cattle grazing on this pasture are sold for beef. About how many calories of energy from the pasture reach human consumers of the beef?
  A)
  10,000 done clear
  B)
  1000 done clear
  C)
  100,000 done clear
  D)
  1,000,000 done clear
  View Solution play_arrow

• question_answer15)
  Which hypothesis regarding what limits food- chain length has the most support?
  A)
  Energy transfer hypothesis done clear
  B)
  Stability hypothesis done clear
  C)
  Environmental complexity hypothesis done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer16)
  Which among the following is likely to have the highest levels of DDT depositions in its body?
  A)
  Eel done clear
  B)
  Crab done clear
  C)
  Seagull done clear
  D)
  Phytoplankton done clear
  View Solution play_arrow

• question_answer17)
  Energy flow through an ecosystem differs from nutrient flow in that:
  A)
  energy flow is linear, done clear
  B)
  nutrient flow is linear. done clear
  C)
  energy flow is cyclical. done clear
  D)
  energy builds as it flows through the ecosystem. done clear
  View Solution play_arrow

• question_answer18)
  Which of the given below pyramids represents the variation in biomass at different trophic levels in pond ecosystem?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer19)
  Which one of the following statement is correct about decomposition?
  A)
  Decomposition rate is slower if detritus is rich in lignin and chitin, and quicker if detritus is rich in nitrogen and water - soluble substances like sugars. done clear
  B)
  Decomposition rate is slower if detritus is rich in nitrogen and water - soluble substances like sugars, and quicker if detritus is rich in lignin and chitin. done clear
  C)
  Decomposition rate is slower if detritus is rich in cellulose, and quicker if detritus is rich in phosphorus. done clear
  D)
  Decomposition rate is quicker if detritus is rich in lignin, and lower if detritus is rich in sulphur. done clear
  View Solution play_arrow

• question_answer20)
  Which of the following statement are correct?

  (i) Deserts and deep lakes show least productivity.

  (ii) 10g by mass is passed to the next trophic level in the food chain.

  (iii) Most productive ecosystem is coral reef.

  (iv) Sugarcane is the most productive crop.

  Choose the correct option.

  A)
  (i) and (iv) done clear
  B)
  (i) and (iii) done clear
  C)
  (ii) and (iii) done clear
  D)
  (i), (iii) and (iv) done clear
  View Solution play_arrow

• question_answer21)
  Because of limitations on resources, organisms must ____ materials in order to survive.
  A)
  Reuse done clear
  B)
  Reinvent done clear
  C)
  Reintroduce done clear
  D)
  Recycle done clear
  View Solution play_arrow

• question_answer22)
  The term ecosystem was coined by:
  A)
  E.P. Odum done clear
  B)
  A.G. Tansley done clear
  C)
  E. Haeckel done clear
  D)
  E. Warming done clear
  View Solution play_arrow

• question_answer23)
  Which of the following is not one of the three aspects studied in biogeochemical cycling?
  A)
  The nature and size of element reservoir. done clear
  B)
  The rate of movement between reservoirs. done clear
  C)
  How different biogeochemical cycles interact. done clear
  D)
  How new species create their own biogeochemical cycles. done clear
  View Solution play_arrow

• question_answer24)
  One way cycle is;
  A)
  \[C{{O}_{2}}\] cycle done clear
  B)
  \[{{H}_{2}}O\] cycle done clear
  C)
  Free energy cycle done clear
  D)
  \[{{O}_{2}}\]cycle done clear
  View Solution play_arrow

• question_answer25)
  Productivity at the second trophic level is always:
  A)
  greater than the productivity at the first trophic level always. done clear
  B)
  less than the productivity at the first trophic level. done clear
  C)
  equal to the productivity at the first trophic level. done clear
  D)
  extremely variable compared to the productivity at the first trophic level. done clear
  View Solution play_arrow

• question_answer26)
  The free floating organisms, of an open sea and shore, are collectively called:
  A)
  Planktons done clear
  B)
  Nektons done clear
  C)
  Benthoic done clear
  D)
  Sea anemone done clear
  View Solution play_arrow

• question_answer27)
  Decomposers such as fungi and bacteria are vital to the ecosystem because they:
  A)
  are the primary organic recyclers. done clear
  B)
  are the terminal energy consumers. done clear
  C)
  keep populations in check. done clear
  D)
  Both [a] and [b] done clear
  View Solution play_arrow

• question_answer28)
  In a food web, each successive trophic level has:
  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_answer29)
  Which of the following organism types would probably rank the highest in terms of their expected efficiency of energy transfer between trophic levels?
  A)
  Herbivorous mammal done clear
  B)
  Carnivorous mammal done clear
  C)
  Invertebrate herbivore done clear
  D)
  Invertebrate carnivore done clear
  View Solution play_arrow

• question_answer30)
  A complex of several species and communities in various stages of succession maintained under similar climatic conditions is known as:
  A)
  Biome done clear
  B)
  Environmental complex done clear
  C)
  Biological spectrum done clear
  D)
  Biological clocks done clear
  View Solution play_arrow

• question_answer31)
  Which of the following features would be characteristic of oceans but not of freshwater ecosystems?
  A)
  Receives material from land mostly via ground water. done clear
  B)
  Seasonal mixing of materials. done clear
  C)
  Elements buried in bottom sediments for long periods of time. done clear
  D)
  Bottom waters frequently lacking oxygen. done clear
  View Solution play_arrow

• question_answer32)
  The occupational address of a species is often called as its:
  A)
  Biome done clear
  B)
  Niche done clear
  C)
  Environment done clear
  D)
  Habitat done clear
  View Solution play_arrow

• question_answer33)
  The two vegetations of an ecosystem are separated by:
  A)
  Ecesis done clear
  B)
  Ecoline done clear
  C)
  Ecophane done clear
  D)
  Ecosystem done clear
  View Solution play_arrow

• question_answer34)
  The lentic ecosystem includes which of following water?
  A)
  Rain done clear
  B)
  Running done clear
  C)
  Standing done clear
  D)
  Gravitational done clear
  View Solution play_arrow

• question_answer35)
  Which of the following could not be considered an ecosystem?
  A)
  A small pond done clear
  B)
  All the fish in a coral reef done clear
  C)
  Earth done clear
  D)
  A pile of dung in a pasture done clear
  View Solution play_arrow

• question_answer36)
  Energy flow and energy transformations in living systems strictly confirm to the:
  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
  View Solution play_arrow

• question_answer37)
  Each trophic level has a certain mass of living material at a particular time is known as:
  A)
  Catabolism done clear
  B)
  Standing crop done clear
  C)
  Humification done clear
  D)
  Primary productivity done clear
  View Solution play_arrow

• question_answer38)
  Which of the following is incorrect for a pyramid of productivity?
  A)
  Only about 10% of the energy in one trophic level is passed into the next level. done clear
  B)
  Because of the loss of energy at each trophic level, most food chains are limited to three to five steps. done clear
  C)
  The pyramid of productivity of some aquatic ecosystems is inverted because of the large zooplankton primary - consumer level. done clear
  D)
  Eating grain-fed beef is an inefficient means of obtaining the energy trapped by photosynthesis. done clear
  View Solution play_arrow

• question_answer39)
  Which of the following statement(s) is/are correct?

  (i) An important characteristic of all communities is that their composition and structure constantly change in response to the changing environmental conditions.

  (ii) The climax community remains stable as long as the environment remains changed.

  (iii) The entire sequence of communities that successively change in a given area are called sere(s).

  A)
  (i), (ii) and (iii) done clear
  B)
  (i) and (ii) done clear
  C)
  (ii) and (iii) done clear
  D)
  (i) and (iii) done clear
  View Solution play_arrow

• question_answer40)
  Given below is one of the types of ecological pyramids. This type represents:
  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

• question_answer41)
  Which is not true regarding wetlands?
  A)
  Natural ground water recharging systems done clear
  B)
  Used as pasture land done clear
  C)
  Purify runoff water done clear
  D)
  Act as sedimentation traps done clear
  View Solution play_arrow

• question_answer42)
  In which life zone of ocean, the producers in the food chains are rarely found?
  A)
  Littoral done clear
  B)
  Limnetic done clear
  C)
  Profundal done clear
  D)
  Intertidal done clear
  View Solution play_arrow

• question_answer43)
  A community which starts succession in a habitat is:
  A)
  Pioneer community done clear
  B)
  Serai community done clear
  C)
  Biotic community done clear
  D)
  Ecosere done clear
  View Solution play_arrow

• question_answer44)
  The flow of materials and energy in an ecosystem is respectively:
  A)
  Cyclic only done clear
  B)
  Cyclic and linear done clear
  C)
  Linear and cyclic done clear
  D)
  Linear only done clear
  View Solution play_arrow

• question_answer45)
  Which food chain produces greater available energy?
  A)
  Diatoms \[\to \]fish\[\to \]large fish\[\to \]birds\[\to \]man done clear
  B)
  Green plant\[\to \]rabbit\[\to \]man done clear
  C)
  Green plant\[\to \]grass hopper\[\to \]frog\[\to \]snake \[\to \]peacock done clear
  D)
  Green plant\[\to \]rabbit\[\to \]wolf\[\to \]man done clear
  View Solution play_arrow

• question_answer46)
  The zone of effective light penetration in oceanic biome is called as:
  A)
  Epipelagic zone done clear
  B)
  Bathypelagic zone done clear
  C)
  Abyssal zone done clear
  D)
  Benthic zone done clear
  View Solution play_arrow

• question_answer47)
  What will happen if decomposers are removed from the ecosystem?
  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_answer48)
  The amount of energy captured by photosynthesis, minus the amount lost as heat in respiration, is:
  A)
  Secondary productivity done clear
  B)
  Consumption efficiency done clear
  C)
  NPP done clear
  D)
  Photosynthetic efficiency done clear
  View Solution play_arrow

• question_answer49)
  Choose the incorrect statements regarding ecological pyramids.

  (i) The relationship between organisms at different trophic levels is expressed in terms of number, biomass and energy.

  (ii) Any calculations of energy content, biomass or number has to include one group of organism at that trophic level.

  (iii) In most ecosystems, all the pyramids of number, biomass and energy are upright.

  (iv) The pyramid of biomass in sea is generally inverted.

  (v) Pyramid of energy is always inverted and can never be upright.

  A)
  (i), (iii) and (iv) done clear
  B)
  Only (i) done clear
  C)
  (ii) and (v) done clear
  D)
  (i) and (v) done clear
  View Solution play_arrow

• question_answer50)
  Match column-I with column-II and select the correct answer using the codes given below.

  	Column-I		Column-II
  A.	Primary succession	I.	Autotrophs
  B.	Climax community	II.	Community that has completed succession
  C.	Consumer	III.	Colonisation of a new environment
  D.	Producer	IV.	Animal

  A)
  A-III;    B-II;    C-IV;    D-I done clear
  B)
  A-III;    B-I;     C-IV;    D-II done clear
  C)
  A-I;       B-III;   C-II;     D-IV done clear
  D)
  A-II;      B-III;   C-IV;   D-I done clear
  View Solution play_arrow

• question_answer51)
  Which of the following statement(s) is/are correct about biogeochemical cycle?

  (i) Gaseous exchanges of phosphorus between organism and environment are negligible.

  (ii) All biogeochemical cycles include both organisms and non-living components.

  (iii)Most elements remain longest in the living portion of their cycle.

  (iv) The chemical elements used by organisms in large quantities cycle back and forth between organisms and environment.

  A)
  (i) and (iii) done clear
  B)
  (i), (ii) and (iv) done clear
  C)
  (i), (ii) and (iii) done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer52)
  Two food chains are shown.

  (i) Tree \[\to \]aphid \[\to \]insectivorous bird \[\to \]prey feed on bird

  (ii) Phytoplankton \[\to \]zooplankton \[\to \]plankton- feeding fish \[\to \]carnivorous fish

  Which diagram is a pyramid of energy representing both food chains?

  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer53)
  When me number to organisms at successive levels are plotted, they give the shape of a pyramid. This is called the pyramid of:
  A)
  Number done clear
  B)
  Energy done clear
  C)
  Biomass done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer54)
  The flow of DDT through the food chain, culminating in the deaths of cats in Borneo, represents the:
  A)
  number of links in an ecosystem. done clear
  B)
  need to understand how resources are passed through an ecosystem. done clear
  C)
  need for stringent testing of anything that might affect the environment. done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer55)
  If an ecosystem is composed of only three trophic levels then how much energy will be conserved at the III trophic level:
  A)
  30% done clear
  B)
  20% done clear
  C)
  10% done clear
  D)
  1% done clear
  View Solution play_arrow

• question_answer56)
  The animals which occupy the same trophic level are:
  A)
  Lion & bees done clear
  B)
  Deer & bees done clear
  C)
  Snakes & earthworm done clear
  D)
  Crow & cow done clear
  View Solution play_arrow

• question_answer57)
  In an aquatic ecosystem, maximum biomagnification is seen among:
  A)
  Fishes done clear
  B)
  Phytoplanktons done clear
  C)
  Zooplanktons done clear
  D)
  Macroscopic plant done clear
  View Solution play_arrow

• question_answer58)
  Pick up the correct food chain.
  A)
  Grass \[\to \]Chamelion \[\to \]Insect \[\to \]Bird done clear
  B)
  Grass \[\to \]Fox \[\to \]Rabbit \[\to \]Bird done clear
  C)
  Phytoplankton \[\to \]Zooplankton \[\to \]Fish done clear
  D)
  Fallen leaves \[\to \]Bacteria \[\to \]Insect larvae done clear
  View Solution play_arrow

• question_answer59)
  Which of the following statements is not a major concern about our altering of the carbon cycle?
  A)
  The Greenland and Antarctic ice caps are expected to melt if global warming continues. done clear
  B)
  High-sulphur fuels are used by power plants because they are less expensive than low-sulphur fuels. done clear
  C)
  The increase in atmospheric \[C{{O}_{2}}\]exceeds the ability of the oceans to absorb the increase. done clear
  D)
  \[C{{O}_{2}}\]is a gas that traps infrared radiation. done clear
  View Solution play_arrow

• question_answer60)
  Which of the following statements concerning acid precipitation is incorrect?
  A)
  Acids that enter the atmosphere primarily affect ecosystems located less than 100 kilometers from the source of the pollution. done clear
  B)
  The effects of acidification of lakes appear to be quickly reversible if their pH can be returned to normal. done clear
  C)
  While regulation of emission sources has raised, the pH of precipitation in parts of the eastern United States, precipitation in many parts of the West is becoming more acidic. done clear
  D)
  Sulfuric acid and nitric acid from smokestack and automobile emissions are the major causes of acid precipitation. done clear
  View Solution play_arrow

• question_answer61)
  Which of the following ecological pyramid is never inverted?
  A)
  Pyramid of number in forest ecosystem. done clear
  B)
  Pyramid of biomass in pond ecosystem. done clear
  C)
  Pyramid of energy in parasitic food chain. done clear
  D)
  Pyramid of biomass in parasitic food chain. done clear
  View Solution play_arrow

• question_answer62)
  Which of following is/are trend (s) in ecological succession?

  (i) An increase in complexity of species.

  (ii) An increase in productivity.

  (iii) An increase in community stability and species diversity.

  (iv) A decrease in nonliving organic materials.

  A)
  (i) and (iii) done clear
  B)
  (i) and (iv) done clear
  C)
  (i), (ii) and (iii) done clear
  D)
  (i), (ii), (iii) and (iv) done clear
  View Solution play_arrow

• question_answer63)
  The following diagram shows a mountain with a sea breeze blowing as indicated by the arrow. Circle the letter for the area with air that would be both relatively warm and dry.
  A)
  Area A done clear
  B)
  Area C done clear
  C)
  Area D done clear
  D)
  Area E done clear
  View Solution play_arrow

• question_answer64)
  The given figure best represents.
  A)
  Pyramid of number in parasitic food chain done clear
  B)
  Pyramid of biomass in forest ecosystem done clear
  C)
  Pyramid of number in grassland ecosystem done clear
  D)
  Pyramid of number in forest ecosystem done clear
  View Solution play_arrow

• question_answer65)
  Which type of pyramid shows best efficiency of ecosystem?
  A)
  Pyramid of number done clear
  B)
  Pyramid of biomass done clear
  C)
  Pyramid of volume done clear
  D)
  Pyramid of energy done clear
  View Solution play_arrow

• question_answer66)
  Tip of ecological pyramid is occupied by:
  A)
  Producers done clear
  B)
  Herbivores done clear
  C)
  Carnivores done clear
  D)
  Omnivores done clear
  View Solution play_arrow

• question_answer67)
  A crocodile has just eaten a lamb. A plover accommodatingly picks the crocodile's teeth. By this act, the plover, in ecological terms, is a:
  A)
  Decomposer done clear
  B)
  Primary consumer done clear
  C)
  Secondary consumer done clear
  D)
  Tertiary consumer done clear
  View Solution play_arrow

• question_answer68)
  Blue whale, which inhabits Antarctica, has a requirement of more than a million calories per day. Which one of the following planktonic organisms forms the bulk of food to fulfill its caloric requirement?
  A)
  Dinoflagellates done clear
  B)
  Diatoms done clear
  C)
  Green algae done clear
  D)
  Krill done clear
  View Solution play_arrow

• question_answer69)
  Competition for water, minerals, light and space is most severe between two:
  A)
  Closely related species occupying the same niche. done clear
  B)
  Closely related species occupying different niche. done clear
  C)
  Unrelated species occupying the same niche. done clear
  D)
  Species occupying different overlapping ecosystems. done clear
  View Solution play_arrow

• question_answer70)
  Consider the following statements.

  (i) An ecosystem is a functional unit of nature and comprises abiotic and biotic components.

  (ii) Abiotic components are organic materials.

  (iii) Biotic components are producers, consumers and decomposers.

  (iv) Energy flow is bidirectional.

  Which two statements are correct?

  A)
  (i) and (ii) done clear
  B)
  (ii) and (iv) done clear
  C)
  (iii) and (iv) done clear
  D)
  (i) and (iii) done clear
  View Solution play_arrow

• question_answer71)
  Which of the following is not a hypothesis for why food-chain length is limited?
  A)
  Food-chain length is limited by one organism's ability to consume another. done clear
  B)
  Food-chain length is limited because they are easily disrupted by environmental perturbations. done clear
  C)
  Food-chain length is limited by productivity. done clear
  D)
  Food-chain length is a function of an ecosystem's physical structure. done clear
  View Solution play_arrow

• question_answer72)
  Which of the following pair is not correctly matched?
  A)
  Autotrophs - Fungi done clear
  B)
  Primary consumers - Zooplankton done clear
  C)
  Secondary consumers - Fishes done clear
  D)
  Decomposers - Flagellates done clear
  View Solution play_arrow

• question_answer73)
  Food chains differ from food webs in that:

  (i) food chains are single sequence of who eats whom in a community.

  (ii) food chains better represent the entire community.

  (iii) food webs represent the complex interaction among food chains.

  (iv) food chain is the flow of energy in a population.

  A)
  (i) and (iii) done clear
  B)
  (i) and (iv) done clear
  C)
  (i), (ii) and (iii) done clear
  D)
  (i), (ii), (iii) and (iv) done clear
  View Solution play_arrow

• question_answer74)
  Decomposition is largely an/a
  A)
  carbon - requiring process done clear
  B)
  oxygen - requiring process done clear
  C)
  nitrogen - requiring process done clear
  D)
  sulphur - requiring process done clear
  View Solution play_arrow

• question_answer75)
  Phosphorus is a sedimentary nutrient. This means it:
  A)
  cycles very slowly. done clear
  B)
  never enters the atmosphere. done clear
  C)
  settles as sediment in the ocean. done clear
  D)
  All of the above done clear
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