UPSC Ecology And Environment Ecology and Environment Question Bank

done Ecology And Environment Total Questions - 116

• question_answer1)
  Which of the following is correct regarding the ecosystem?
  A)
  Primary consumers are least dependent upon producers done clear
  B)
  Primary consumers out-number producers done clear
  C)
  Producers are more than primary consumers done clear
  D)
  Secondary consumers are the largest and most powerful. done clear
  View Solution play_arrow

• question_answer2)
  Homeostasis is
  A)
  Tendency of biological systems to change with change in environment done clear
  B)
  Tendency of biological systems to resist change done clear
  C)
  Disturbance of self-regulatory system and natural controls done clear
  D)
  Biotic materials used in homeopathic medicines. done clear
  View Solution play_arrow

• question_answer3)
  Food chain in which microorganisms breakdown the food formed by primary producers is
  A)
  Parasitic food chain         done clear
  B)
  Detritus food chain done clear
  C)
  Consumer food chain done clear
  D)
  Predator food chain. done clear
  View Solution play_arrow

• question_answer4)
  If we completely remove the decomposers from an ecosystem, its functioning will be adversely affected because of:
  A)
  Mineral movement will be blocked done clear
  B)
  The rate of decomposition will be very high done clear
  C)
  Energy flow will be blocked done clear
  D)
  Herbivores will not receive solar energy. done clear
  View Solution play_arrow

• question_answer5)
  The abundance of a species population, within its habitat, is called:
  A)
  Relative density  done clear
  B)
  Regional density done clear
  C)
  Absolute density done clear
  D)
  Niche density. done clear
  View Solution play_arrow

• question_answer6)
  The primary succession refers to the development of communities on a:
  A)
  Forest clearing after devastating fire done clear
  B)
  Newly-exposed habitat with no record of earlier vegetation done clear
  C)
  Freshly cleared crop field done clear
  D)
  Pond, freshly filled with water after a dry phase. done clear
  View Solution play_arrow

• question_answer7)
  Which of the following pairs is correctly matched?
  A)
  Parasitism - ultra-specific relationship done clear
  B)
  Uricotelism - aquatic habitat done clear
  C)
  Excessive perspiration - xeric adaptation done clear
  D)
  Stream lined body - aquatic adaptation. done clear
  View Solution play_arrow

• question_answer8)
  The 'niche' of a species is meant for
  A)
  Habitat and specific functions of a species done clear
  B)
  specific place where an organism lives done clear
  C)
  specific species function and its competitive power done clear
  D)
  none of these. done clear
  View Solution play_arrow

• question_answer9)
  Certain characteristic demographic developing countries are:
  A)
  high fertility, low or rapidly fall rate, rapid population growth and age distribution done clear
  B)
  high fertility, high density, mortality rate and a very young age done clear
  C)
  high infant mortality, low fertility population growth and a very distribution done clear
  D)
  high mortality, high density, uneven growth and a very old age distribution. done clear
  View Solution play_arrow

• question_answer10)
  What is a keystone species?
  A)
  a species which makes up only a small proportion of the total biomass of a community, yet has a huge impact community's organization and s done clear
  B)
  a common species that has plenty of biomass yet has a fairly low impact on the community organization done clear
  C)
  a rare species that has minimal impact on the biomass and on other species in the community done clear
  D)
  a dominant species that constitutes a large proportion of the biomass and which affects many other species. done clear
  View Solution play_arrow

• question_answer11)
  The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?
  A)
  the food plants mature and die at the end of the rainy season done clear
  B)
  its population growth curve is of J-type done clear
  C)
  the population of its predators increases  enormously done clear
  D)
  S-shaped or sigmoid growth of this insect. done clear
  View Solution play_arrow

• question_answer12)
  Which one of the following statements is correct?
  A)
  Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants. done clear
  B)
  Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil done clear
  C)
  At present it is not possible to grow maize without chemical fertilizers done clear
  D)
  Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies. done clear
  View Solution play_arrow

• question_answer13)
  Atmospheric nitrogen is converted to nitrogen oxides
  A)
  when fossil fuels are burned at high combustion temperatures. done clear
  B)
  if the sun is shining brightly and there is a temperature inversion. done clear
  C)
  on cloudy days when carbon and soot levels are unusually high. done clear
  D)
  if radon gas is present when gasoline is burned in automobiles. done clear
  View Solution play_arrow

• question_answer14)
  Having covered millions of acres of grasslands, the toxic weed leafy spurge has caused serious damage to the lower regions of Himachal. Being toxic in nature it is avoid by both cattle and horses alike. Leafy spurge has spread completely across many neighboring states of Uttaranchal. If left uncontrolled in these states, leafy spurge populations will:
  A)
  keep growing indefinitely. done clear
  B)
  reach their carrying capacity. done clear
  C)
  shift from a S-curve to a constant rate of growth. done clear
  D)
  shift from an S-shaped curve to a J-shaped growth curve. done clear
  View Solution play_arrow

• question_answer15)
  Some beetles escape from a ship and fly to a small island covered with grass but with no trees or beetle predator. As the beetles feed, they destroy all the grasses. But with abundant food, the beetle population soars, doubling in size every month. After about a year, the population crashes as thousands of beetles have destroyed almost all of the plants and there is little left to feed the large population. This scenario best illustrates
  A)
  constant growth followed by equilibrium. done clear
  B)
  a population that has stabilized near its carrying capacity. done clear
  C)
  exponential growth followed by a population crash. done clear
  D)
  logistic growth ending at its carrying capacity. done clear
  View Solution play_arrow

• question_answer16)
  Which of the following is NOT true regarding biotic potential?
  A)
  Environmental resistance factors such as disease and available space can prevent a population from maximizing its biotic potential done clear
  B)
  The biotic potential is the average rate of growth of a population over time done clear
  C)
  The ratio of males to females in a population is a characteristic mat is used to determine biotic potential done clear
  D)
  The number of individuals of re-productive age in a population is a parameter used to determine biotic potential. done clear
  View Solution play_arrow

• question_answer17)
  Which one of the following statements about the carbon, phosphorus, and nitrogen cycles is true?
  A)
  The major source of carbon used by plants is the soil done clear
  B)
  The major source of nitrogen used by plants is the air. done clear
  C)
  Phosphorus has no atmospheric component. done clear
  D)
  Bacteria drive the phosphorus cycle. done clear
  View Solution play_arrow

• question_answer18)
  Synecology deals with
  A)
  Ecology of many species done clear
  B)
  Ecology of many populations done clear
  C)
  Ecology of community done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer19)
  Ecotype includes a type of species in which are environmentally induce variations are:
  A)
  Temporary       done clear
  B)
  Genetically not related done clear
  C)
  Genetically fixed done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer20)
  Humans often manipulate the environment in ways that decrease the overall ecosystem capital because
  A)
  short term gains are often local while long-term losses in regulating and cultural services are experienced regionally. done clear
  B)
  short term gains are often regional while long term losses in regulating and cultural services are experienced locally. done clear
  C)
  long term gains are often local while short term losses in regulating and cultural services are experienced regionally. done clear
  D)
  long term gains are often regional while short- term losses in regulating and cultural services are experienced locally. done clear
  View Solution play_arrow

• question_answer21)
  Primary productivity of the open oceans is very limited because of:
  A)
  the shortage of water. done clear
  B)
  the shortage of light. done clear
  C)
  the shortage of nutrients. done clear
  D)
  low temperature. done clear
  View Solution play_arrow

• question_answer22)
  The economic gap between developing and industrialized countries may best be narrowed by
  A)
  the adoption of democratic forms of government in developing countries. done clear
  B)
  industrialized countries increasing shipments of food supplies to developing countries. done clear
  C)
  industrialized countries harvesting more natural resources in developing countries. done clear
  D)
  stabilizing population growth  in developing countries. done clear
  View Solution play_arrow

• question_answer23)
  The term Biocoenosis was proposed by
  A)
  A G Tansley                   done clear
  B)
  Karl Mobius done clear
  C)
   R H Whittaker   done clear
  D)
  Robert Hooke done clear
  View Solution play_arrow

• question_answer24)
  Biomes with permafrost are most likely:
  A)
  covered in coniferous forests at high latitudes. done clear
  B)
  in temperate zones with deciduous trees. done clear
  C)
  located near the poles and without any trees. done clear
  D)
  located at high altitudes nearest the equator. done clear
  View Solution play_arrow

• question_answer25)
  Consumers that eat plants rely upon:
  A)
  chemical energy stored in organic molecules produced by photosythesis. done clear
  B)
  kinetic energy stored in organic molecules produced by photosynthesis. done clear
  C)
  photosynthesis to convert potential energy to kinetic energy. done clear
  D)
  entropy to generate heat to drive kinetic processes in their bodies. done clear
  View Solution play_arrow

• question_answer26)
  Species that occur in different geographical regions separated by special barrier are:
  A)
  Allopatric                       done clear
  B)
  Sympatric done clear
  C)
  Sibling                           done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer27)
  Deciding to use a natural enemies approach to control the mites that infect her crops, a farmer purchases 10,000 ladybugs in the spring and spreads them over her 100 acre fields. This represents the use of natural:
  A)
  predators                       done clear
  B)
  parasitoids done clear
  C)
  pathogens                      done clear
  D)
  plant-eaters done clear
  View Solution play_arrow

• question_answer28)
  Deep in the ocean off the shore of Japan, are communities nestled around hydro thermal vents where super-heated water, springs from the bottom of the ocean. No sunlight ever penetrates to these deep regions. In these communities, bacteria have special enzymes that allow them to form organic matter by chemosynthesis. These communities frequently have worms, clams, shrimp, and many other organisms clustered together. In such a system, fish feed on shrimp that feed on the bacteria. This food chain represents a:
  A)
  tertiary consumer eating a secondary consumer eating a primary consumer. done clear
  B)
  primary consumer eating a secondary consumer eating a tertiary consumer. done clear
  C)
  consumer eating a producer which then consumes chemoautotrophic bacteria. done clear
  D)
  secondary consumer eating a primary consumer which then eats a producer. done clear
  View Solution play_arrow

• question_answer29)
  Density-independent factors such as earthquakes and hurricanes are:
  A)
  abiotic factors that maintain a population near equilibrium. done clear
  B)
  biotic factors that maintain a population near equilibrium. done clear
  C)
  abiotic factors that are not involved in maintaining a population near its equilibrium. done clear
  D)
  biotic factors that are not involved in maintaining a population near its equilibrium. done clear
  View Solution play_arrow

• question_answer30)
  Developing a new form of ecological pest control, researchers engineer crops to produce the pheromones of the pest. The crops now produce the pest pheromone, overwhelming the fields and causing the male pests to fail to find a mate. This new form of ecological pest control combines:
  A)
  natural enemies and cultural control. done clear
  B)
  cultural and natural enemies control. done clear
  C)
  genetic and cultural control. done clear
  D)
  genetic and natural chemical control. done clear
  View Solution play_arrow

• question_answer31)
  Dung beetles feeding on the waste of cattle, grazing on hay in a field, represent:
  A)
  a decomposer feeding on the wastes of a consumer eating a producer. done clear
  B)
  a producer feeding on the wastes of a producer eating a consumer. done clear
  C)
  a producer feeding on the wastes of a consumer eating a producer. done clear
  D)
  a consumer feeding on the wastes of a decomposer eating a producer. done clear
  View Solution play_arrow

• question_answer32)
  Ecosystem sustainability primarily results from the:
  A)
  relationships between the organisms in an ecosystem. done clear
  B)
  number of predators found in the ecosystem. done clear
  C)
  frequency of fires or other natural disasters in an ecosystem. done clear
  D)
  total amount of biomass that exists in an ecosystem. done clear
  View Solution play_arrow

• question_answer33)
  Ecotones:
  A)
  contain only species found in the bordering ecosystems. done clear
  B)
  have the same abiotic characteristics as the bordering ecosystems. done clear
  C)
  consist of two or more landscapes. done clear
  D)
  are transitional regions between ecosystems. done clear
  View Solution play_arrow

• question_answer34)
  Energy transfer between trophic levels in aquatic systems is generally:
  A)
  less efficient than terrestrial food pyramids. done clear
  B)
  less efficient than a detritus food web because aquatic systems lack fungi. done clear
  C)
  inverted, in which more energy is transferred from one trophic level up to the next. done clear
  D)
  more efficient than terrestrial food pyramids. done clear
  View Solution play_arrow

• question_answer35)
  For more than 20 years, scientists have been analyzing expected climate change and the impact on crops grown in particular regions. For example, states that typically plant corn and soybeans may need to switch to growing cotton. Such a change is an example of:
  A)
  mitigation          done clear
  B)
  a cap-and-trade policy done clear
  C)
  adaptation         done clear
  D)
  stabilization wedge done clear
  View Solution play_arrow

• question_answer36)
  In a forest, deer, raccoons, squirrels, and other animals eat and find shelter. A detritus food web occurs as their wastes accumulate on the forest floor. In this detritus web
  A)
  deer and raccoons function as the producers. done clear
  B)
  fungi and earthworms function as producers. done clear
  C)
  decomposers function as consumers. done clear
  D)
  the deer and raccoons represent decomposers. done clear
  View Solution play_arrow

• question_answer37)
  In an ecosystem with many similar species, we typically find:
  A)
  intense interspecific competition for food. done clear
  B)
  competitors using different resources. done clear
  C)
  intense interspecific competition for nesting sites. done clear
  D)
  adaptations for battles and interspecific competition. done clear
  View Solution play_arrow

• question_answer38)
  In an ecosystem, the replacement of one new species for another because of direct competition for the same resources defines:
  A)
  intraspecific competition. done clear
  B)
  the competitive exclusion principle. done clear
  C)
  character displacement. done clear
  D)
  resource partitioning. done clear
  View Solution play_arrow

• question_answer39)
  Maintaining sustainable human exploitation of ecosystem capital will be increasingly difficult because of:
  A)
  the over reliance on grains and other plants as a significant portion of the human diet. done clear
  B)
  the expanding number of vital and bacterial human diseases. done clear
  C)
  the growing human population on Earth. done clear
  D)
  decreases in worldwide ocean levels. done clear
  View Solution play_arrow

• question_answer40)
  Persistent organic pollutants (POPs) reach toxic levels in organisms in natural ecosystems in large part because of bio magnification, in which the highest concentrations of POPs are found in:
  A)
  primary producers done clear
  B)
  secondary producers done clear
  C)
  primary consumers done clear
  D)
  secondary consumers done clear
  View Solution play_arrow

• question_answer41)
  Some birds have been seen to consume certain soils in what is called geophagy. In some cases, the soils help the birds digest toxins that occur in their diets. These birds eating soil represent a member of the:
  A)
  biosphere consuming a component of the lithosphere. done clear
  B)
  hydrosphere consuming a component of the atmosphere. done clear
  C)
  lithosphere consuming a component of the biosphere. done clear
  D)
  atmosphere consuming a component of the hydrosphere. done clear
  View Solution play_arrow

• question_answer42)
  In a food chain of a grassland ecosystem the top consumers are:
  A)
  Herbivores done clear
  B)
  Carnivores done clear
  C)
  Bacteria done clear
  D)
   Either Carnivores or Herbivores done clear
  View Solution play_arrow

• question_answer43)
  Biotic Potential is counteracted by:
  A)
  Competition with other organism done clear
  B)
  Producer is the largest done clear
  C)
  Limitation of food supply done clear
  D)
  None of the above done clear
  View Solution play_arrow

• question_answer44)
  Which of the following represents a type of mutualism?
  A)
  A red-tailed hawk pounces on a field mouse for dinner. done clear
  B)
  A large herd of zebra graze lazily across the broad savannah done clear
  C)
  A mosquito draws a blood meal from the back of an elk. done clear
  D)
  A nectar-feeding bat swoops in to drink nectar from some flowers. done clear
  View Solution play_arrow

• question_answer45)
  Which one of the following illustrates interspecific competition?
  A)
  The largest wolves in a pack are the first to feed on a freshly killed deer. done clear
  B)
  Two honeybees from the same colony converge on a flower to collect pollen & nectar. done clear
  C)
  Advertising its nectar with red colors, a columbine flower attracts a hummingbird for a meal. done clear
  D)
  Standing near the dead antelope, vultures wait for the lions to finish their meal. done clear
  View Solution play_arrow

• question_answer46)
  Why are there so few ecosystems with more than four levels of consumers?
  A)
  because biomass decreases by about 90% at each level moving up. done clear
  B)
  because top consumers compete with and kill each other with increasing population size. done clear
  C)
  done clear
  D)
  because consumers at these highest levels typically form social groups that stop reproducing at high densities. done clear
  E)
  because predators at the highest levels simply are not intelligent enough to hunt other top predators. done clear
  View Solution play_arrow

• question_answer47)
  Regulating and cultural services provided by natural ecosystems:
  A)
  are typically the most economically valued components of ecosystems. done clear
  B)
  are public goods usually provided by markets. done clear
  C)
  include goods such as fresh water, wild foods, and livestock. done clear
  D)
  are essential but difficult to value in monetary terms. done clear
  View Solution play_arrow

• question_answer48)
  The phrase "ecosystem capital" is better than the phrase "natural resources" because ecosystem capital:
  A)
  includes the ecological value of natural ecosystems. done clear
  B)
  includes the economic value of an ecosystem's goods and services. done clear
  C)
  does not include the value of natural ecosystems. done clear
  D)
  does not include the economic value of an ecosystem's goods and services. done clear
  View Solution play_arrow

• question_answer49)
  A sandy and saline area is the natural habitat of an Indian animal species. The animal has no predators in that area but its existence is threatened due to the destruction of its habitat. Which one of the following could be that animal?
  A)
  Indian wild buffalo          done clear
  B)
  Indian wild ass done clear
  C)
  Indian wild boar  done clear
  D)
  Indian gazelle done clear
  View Solution play_arrow

• question_answer50)
  In addition to global climate change, humans are negatively impacting coral reefs by:
  A)
  destructive harvesting of fish for food or pets. done clear
  B)
  using large amounts of coral rock to pave roads. done clear
  C)
  destroying large regions of coral reefs for commercial aquaculture. done clear
  D)
  introducing alien species that are thought to be more productive. done clear
  View Solution play_arrow

• question_answer51)
  The concept of sustainable development relates to:
  A)
  consumption level done clear
  B)
  exhaustible resources done clear
  C)
  social equity done clear
  D)
  Intergenerational equity done clear
  View Solution play_arrow

• question_answer52)
  The variability among living organisms from all sources including terrestrial, marine and other ecosystems and the ecological complexes of which they are part which includes diversity within species, between species of eco- systems refers to:
  A)
  geographical diversity done clear
  B)
  zoological diversity done clear
  C)
  ecological diversity done clear
  D)
  biological diversity done clear
  View Solution play_arrow

• question_answer53)
  Population dividend' refers to:
  A)
  total number of population youthful age structure of a population done clear
  B)
  relatively high proportion of experienced aged people done clear
  C)
  migration from richer region to poorer region done clear
  View Solution play_arrow

• question_answer54)
  Inclusion strategy does not focus on:
  A)
  reduction of inequality done clear
  B)
  reduction of poverty done clear
  C)
  diversifying livelihood for tribal population done clear
  D)
  getting poorer countries close done clear
  View Solution play_arrow

• question_answer55)
  Which one of the following is the best description of the term 'ecosystem'?       (IAS Prelims 2016)
  A)
  A community of organisms interacting with one another. done clear
  B)
  That part of the Earth which is inhabited by living organisms. done clear
  C)
  A community of organisms together with the environment in which they live done clear
  D)
  The flora and fauna of a geographical area done clear
  View Solution play_arrow

• question_answer56)
  Which of the following groups contains only easily biodegradable items?

  1. Grass, flower and leather

  2. Grass, wood and plastic

  3. Fruits, peel cake and lime juice

  4. Cake, wood and grass.

  Which of the above is/are correct?
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1, 3 and 4          done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer57)
  Consider the following statements:

  1. The amount of usable energy remains constant as it is passed from one trophic level to another.

  2. The energy within an ecosystem is fixed and never changes.

  Which of these statement(s) is/are correct?
  A)
  1 only done clear
  B)
  2 only done clear
  C)
  Both 1 and 2 done clear
  D)
  neither 1 nor 2 done clear
  View Solution play_arrow

• question_answer58)
  Select the correct combination of statements (I - IV) regarding the characteristics of productivity.

  1. The rate of biomass production is called productivity and is expressed in terms of a kcal.

  2. Gross primary productivity is rate of production of biomass during photosynthesis.

  3. Gross primary productivity minus respiration loss is called net primary productivity.

  4. Primary productivity depends only on the plant species inhabiting a particular area.

  Which of the following statement(s) is/are correct?
  A)
  1, 2 and 3                      done clear
  B)
  2 and 3 done clear
  C)
  2, 3 and 4                      done clear
  D)
  2 and 4 done clear
  View Solution play_arrow

• question_answer59)
  Food chains differ from food webs in that:

  1. food chains are single sequence of who eats whom in a community.

  2. food chains better represent the entire community.

  3. food webs represent the complex interaction among food chains.

  4. food chain is the flow of energy in a population.

  Which of the following statement(s) is/are correct?
  A)
  1 and 2             done clear
  B)
  1 and 3 done clear
  C)
  1, 2 and 3                      done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer60)
  Which of following is/are tend (s) in ecological succession?

  1. An increase in complexity of species

  2. An increase in productivity

  3. An increase in community stability and species diversity

  4. A decrease in nonliving organic materials.

  Which of the above is/are correct?
  A)
  1 and 2             done clear
  B)
  1 and 4 done clear
  C)
  1, 3 and 3          done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer61)
  Which of the following include(s) ecosystem services?

  1. Purification of air and water by forests

  2. Forests mitigate droughts and flood

  3. Forests act as store house of carbon

  4. Forests influence hydrological cycle

  Which of the above is/are correct?
  A)
  1 and 3             done clear
  B)
  1 and 4 done clear
  C)
  1, 2 and 3                      done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer62)
  Which one is not the dynamic aspect of an ecosystem?

  1. Producers and mineral cycles

  2. Consumers and mineral cycles

  3. Producers and energy flow

  4. Energy flow and mineral cycles

  Which of the above is/are correct?
  A)
  1 and 2             done clear
  B)
  2 and 4 done clear
  C)
  1, 2 and 3          done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer63)
  Which of the following statements are true about ecosystem? Select the correct answer from the codes:

  1.  Ecosystem comprises both biotic and abiotic components.

  2.  Solar radiation is the main driving force of the ecosystem.

  3.  Ecosystem is a closed system.

  4.  Ecosystem does not have its own productivity

  Codes:
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  3 and 4 done clear
  View Solution play_arrow

• question_answer64)
  Which of the following are the incorrect statements about 'Keystone species'.

  1. Keystone species are the small-sized plants and organisms which have large effect on the environment.

  2. Keystone species play critical role in maintaining the structure of an ecological community.

  3. Keystone species do not generally affect other organisms.

  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  All are correct done clear
  View Solution play_arrow

• question_answer65)
  Which of the following are correct statements about light in aquatic environments?

  1. Water selectively reflects and absorbs certain wavelengths of light.

  2. Photosynthetic organisms that live in deep water probably utilize red light.

  3. Light intensity is an important abiotic factor in limiting the distribution of photosynthetic organisms.

  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 3 only                  done clear
  D)
  2 and 3 only done clear
  View Solution play_arrow

• question_answer66)
  The producers in ecosystems include which of the following?

  1. Prokaryotes

  2. Algae

  3. Plants

  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  1, 2, and 3 done clear
  View Solution play_arrow

• question_answer67)
  Aquatic primary productivity is often limited by which of the following?

  1. light

  2. nutrients

  3. pressure

  A)
  2 only               done clear
  B)
  3 only done clear
  C)
  1 and 2 only                  done clear
  D)
  1, 2, and 3 done clear
  View Solution play_arrow

• question_answer68)
  Consider the following statements:

  1. Interactions between the two organisms in which one organism kills sand feed on the second organisms, is, called Parasitism.

  2. Mutualism is the way two organisms of different species biologically interact in a relationship in which each individual derives a fitness benefit.

  Which of the statements given above is/are true?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2 both                  done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer69)
  Consider the following:

  1. Bioaccumulation is the increases in concentration of a pollutant from the environment to the first organism in a food chain.

  2. Biomagnification is then increases in concentration of pollutant from one link in a food chain to another.

  Which of the statements given above is/are true?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2 both                  done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer70)
  Consider the following statements:

  1. In ecology, an ecosystem is a naturally occurring assemblage of organism (plant, animal and other living organism - also referred to as a biotic community of biocoenosis) living together with their environment (or biotope), function as a unit of sorts.

  2. The term "ecosystem" first coined by Arthur Tansely.

  Which of the statements given above is/are correct?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2 both                  done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer71)
  Which of the following statements is true?

  1. Circulation of energy in the biosphere ecosystem is cyclical.

  2. Circulation of matter in the biosphere ecosystem is unidirectional.

  Select the correct answer using the codes given below:
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2 only                  done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer72)
  Consider the following statements :

  1. Waste are of two types, biodegradable and non- biodegradable.

  2.  Blue-green algae are producers.

  3.  Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.

  Which of these statement(s) is/are correct?
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1, 2 and 3                      done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer73)
  Not all parasitism involves feeding on the body of the host. The exception is:

  1. Ectoparasitism

  2. Endopasitism

  3. Parasitoids

  4. Brood Parasitism

  Choose the option from the codes given below:
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  4 only done clear
  View Solution play_arrow

• question_answer74)
  What factor does not contribute to the rapid loss of nutrients from terrestrial ecosystems?

  1. Clear cutting native forests

  2. Early serai stages

  3. Climax communities

  4. Low diversity

  Choose the correct option from the codes given below:
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  3 only               done clear
  D)
  3 and 4 done clear
  View Solution play_arrow

• question_answer75)
  When two organisms attempt to utilize the same resource, the result is:

  1. A fundamental niche

  2. Competition

  3. Commensalism

  4. Mutualism

  Choose the correct option from the codes given below:
  A)
  1 and 2             done clear
  B)
  2 only done clear
  C)
  3 and 4             done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer76)
  With reference to food chains in ecosystems, consider the Following statements:

  1. A food chain illustrates the order in which a chain of organisms feed upon each other.

  2. Food chains are found within the populations of a species.

  3. A food chain illustrates the numbers of each organism which are eaten by others.

  Which of the statements given above is/are correct?
  A)
  1 only               done clear
  B)
  1 and 2 only done clear
  C)
  1, 2 and 3                      done clear
  D)
  None done clear
  View Solution play_arrow

• question_answer77)
  With reference to the food chains in ecosystems, which of the following kinds of organism is/are known as decomposer organism/organisms?

  1. Virus

  2. Fungi

  3. Bacteria

  Select the correct answer using the codes given below.
  A)
  1 only               done clear
  B)
  2 and 3 only done clear
  C)
  1 and 3 only                  done clear
  D)
  1, 2 and 3 done clear
  View Solution play_arrow

• question_answer78)
  Consider the following :

  1. Bats

  2. Bears

  3.  Rodents

  The phenomenon of hibernation can be observed in which of the above kinds of animals?
  A)
  1 and 2 only done clear
  B)
  2 only done clear
  C)
  1, 2 and 3 done clear
  D)
  Hibernation cannot be observed in any of the above done clear
  View Solution play_arrow

• question_answer79)
  Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?

  1. Volcanic action

  2. Respiration

  3. Photosynthesis

  4. Decay of organic matter

  Select the correct answer using the code given below.
  A)
  1 and 3 only                  done clear
  B)
  2 only done clear
  C)
  1, 2 and 4 only   done clear
  D)
  1, 2, 3 and 4 done clear
  View Solution play_arrow

• question_answer80)
  With reference to two non-conventional energy sources called 'coalbed methane' and 'shale gas consider the following statements :

  1. Coalbed methane is the pure methane gas extracted from coal seams while shale gas is a mixture of propane and butane only that can be extracted from fine-grained sedimentary rocks.

  2. In India abundant coalbed methane sources exist but so far no shale gas sources have been found.

  Which of the statements given above is/are correct?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  Both 1 and 2                  done clear
  D)
  neither 1 nor 2 done clear
  View Solution play_arrow

• question_answer81)
  The study of relationship of living organism with each other and with their environment is called_____.

  1. Economy

  2. Ecology

  3. Geography

  4. Environment

  Which among the following defines the statement
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  4 only done clear
  View Solution play_arrow

• question_answer82)
  Consider the following statement related to Abiotic

  1.  Abiotic components of ecosystem are the living features of ecosystem on which the living organism depends.

  2. Abiotic component is referred to the physical environment and its numerous interacting variables.

  Which among the following statement is correct
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  Both 1 and 2                  done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer83)
  What is the name of processes of Nitrogen cycle?

  1. Nitrogen Fixation

  2. Nitrification

  3. Assimilation

  4. Denitrification

  Choose the correct option
  A)
  1 and 2             done clear
  B)
  3 and 4 done clear
  C)
  1, 2, 3               done clear
  D)
  1, 2, 3, 4 done clear
  View Solution play_arrow

• question_answer84)
  Which equation explains Nitrification?

  1. \[N{{H}_{3}}\to N{{O}_{2}}\to N{{O}_{{{3}^{\,-}}}}\]

  2. \[N{{H}_{3}}\to N{{O}_{3}}\to N{{O}_{{{2}^{\,-}}}}\]

  3. \[N{{H}_{3}}\to N{{O}_{3}}\to N{{O}_{{{2}^{\,-}}}}\]

  Select the correct answer from the following codes
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
   3 only              done clear
  D)
  All of the Above done clear
  View Solution play_arrow

• question_answer85)
  Atmosphere contains 21 % of which gas?

  1.  Nitrogen

  2. Oxygen

  3. Phosphorous

  A)
  1 only              done clear
  B)
  2 only done clear
  C)
  3 only          done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer86)
  What is the purpose of Ozone layer?

  1. Protects UV rays to reach on earth

  2. Helps UV rays to reach earth

  3. The source of ozone is the oxygen in the atmosphere

  Choose the correct code
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer87)
  Consider the following statements:

  1. Burning fossil fuel decreases oxygen in atmosphere

  2. Burning fossil fuel increases carbon dioxide

  3. The main source of oxygen is atmosphere

  Which among the following code is incorrect?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer88)
  How is the oxygen cycle effected?

  1. Human activities

  2. Running of automobiles

  3. Consumption of fossil fuels

  Choose the correct code
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer89)
  With reference to the process of photosynthesis for carbon dioxide, which of the following statement is correct?

  1. Through the process of photosynthesis carbon enters into non-living world in the form of carbon dioxide.

  2. Recycling of carbon is done by the burning of fossil fuels.

  Select the correct answer from the following codes
  A)
  1 Only   done clear
  B)
  2 only done clear
  C)
  1 and 2 done clear
  D)
  Neither of the Above done clear
  View Solution play_arrow

• question_answer90)
  Which of the following is not involved in the continuous water exchange?

  1. Stones

  2. Air

  3. Land

  4. Sea

  Choose the correct code
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2             done clear
  D)
  3 and 4 done clear
  View Solution play_arrow

• question_answer91)
  Consider the following statement

  1. Evaporation takes water into atmosphere in the form of vapors.

  2. Clouds are formed when the vaporized water is cooled and condensed.

  Which of the following statement is correct?
  A)
  1 only   done clear
  B)
  2 only done clear
  C)
  1 and 2 done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer92)
  Name the elements that help in creating phosphorous cycle?

  1. Rocks

  2. Earth crust

  3. Air

  4. Water

  Choose the correct code
  A)
  1 and 2             done clear
  B)
  3 and 4 done clear
  C)
  1 and 3             done clear
  D)
  1 and 4 done clear
  View Solution play_arrow

• question_answer93)
  Why phosphorous is not found in atmosphere?

  1. It doesn't combine well with other elements

  2. It just cannot be found

  3. The sun evaporates it

  4. At normal temperatures and pressure, phosphorous is at a liquid state

  Choose the correct code from the following statement regarding phosphorous
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  4 only done clear
  View Solution play_arrow

• question_answer94)
  How does phosphorous enter plants in the soil?

  1. Photosynthesis

  2. Water in the soil

  3. Rocks on the sand

  Choose the correct answer
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer95)
  What is the impact of human on phosphorous cycle?

  1. Killing plants

  2. No impact

  3. Pollution

  4. Use fertilizers that are not natural

  Choose the correct code
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  4 only done clear
  View Solution play_arrow

• question_answer96)
  Megatherms is defines as

  1. Organisms living in tropical regions

  2. Organisms living in subtropical regions

  3. Organisms living in temperate regions

  Choose the correct definition of Megatherms
  A)
  1 only            done clear
  B)
  2 only done clear
  C)
  3 only            done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer97)
  Consider the following related to humidity

  1. Humidity is the water vapor present in the atmosphere.

  2. Humidity is measured by barometer

  3. Humidity is defined as molecules of water/unit volume

  Choose the correct code
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer98)
  ____are the living organism that shapes the ecosystem and comes regularly in contact with each other.
  A)
  Abiotic components done clear
  B)
  Biotic componenets done clear
  C)
  Antibiotic components done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer99)
  Consider the following statement in regards to ecosystem

  1. Components of an ecosystem include Biotic

  2. Components of an ecosystem include Abiotic

  Which of the following statement is correct?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2             done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer100)
  The process of cycling of minerals and components through the ecosystem is called____

  1. Biological cycle

  2. Biogeochemical cycle

  3. Biochemical cycle

  Choose the correct code
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer101)
  Name the forest that is found in Asia, Europe.

  1. Boreal Forest

  2. Temperate Deciduous Forests

  3. Tropical or Rainforests

  Choose the correct name
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  All of the Above done clear
  View Solution play_arrow

• question_answer102)
  Consider the following statement

  1. The soil of Temperate Deciduous forests is richer than boreal forests.

  2. Temperate Deciduous forests are mostly found in the equatorial belt of the plant.

  Which statement is incorrect?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2             done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer103)
  Which forest does not see winter season?

  1. Boreal Forest

  2. Temperate Deciduous Forests

  3. Tropical Forest

  Choose the correct code
  A)
  1 only               done clear
  B)
  1 and 2 done clear
  C)
  1, 2, 3               done clear
  D)
  3 only done clear
  View Solution play_arrow

• question_answer104)
  How much desert area exists on the planet?
  A)
  One third                       done clear
  B)
  Half done clear
  C)
  One fifth                        done clear
  D)
  One fourth done clear
  View Solution play_arrow

• question_answer105)
  Marine lives are found in which place?

  1. Ocean

  2. Lake

  3. Ponds

  4. Sand

  Choose the correct code
  A)
  1, 2                               done clear
  B)
  3, 4 done clear
  C)
  1, 2, 3               done clear
  D)
  1, 2, 3, 4 done clear
  View Solution play_arrow

• question_answer106)
  Consider the following statement

  1. Most of the oxygen in the atmosphere is generated by the algae.

  2. Evaporation of salt and water turns into rain

  3. Large amount of carbon dioxide is absorbed by the algae in the atmosphere.

  Which statement is incorrect?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer107)
  The water that has less content of salt is called __

  1. Sea

  2. Fresh water

  3. Oil

  Choose the correct code
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  All of the Above done clear
  View Solution play_arrow

• question_answer108)
  Consider the following statement

  1.  Atmospheric temperature of the place depends upon the slope, altitude, latitude, topography.

  2. Temperature increases as we go from equator to poles.

  3. Temperature lowers as we go from equator to poles

  Choose the incorrect statement
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer109)
  Consider the following statements

  1. Three fourth of the earth surface is covered by water but less than 3% is fresh water used for human consumption.

  2. Of the total fresh water available, Ice cap has highest share of 2% followed by ground water 0.68%. Select the correct answer using the code given below.

  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2             done clear
  D)
  Neither of the Above done clear
  View Solution play_arrow

• question_answer110)
  With reference to phosphorus cycling, consider the following statements

  1. The natural reservoir of phosphorus is atmosphere, which contains phosphorus in the form of phosphates.

  2. Herbivores and other animals obtain phosphorus from plants.

  3. Unlike carbon cycle, there is no respiratory release of phosphorus into atmosphere.

  Which of the statements given above is/are correct?
  A)
  1 and 2             done clear
  B)
  2 and 3 done clear
  C)
  1 and 3             done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer111)
  What is the name of the cycle where the continuous and balanced process of evaporation, precipitation, transpiration and runoff of water takes place.

  1. Hydrological

  2. Tropological

  3. Hyper logical

  Choose the correct option
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer112)
  With reference to ecosystem stability, consider the following statements

  1. A diverse and complex ecosystem is more stable.

  2. Ecosystem stability increases with decrease in number of links in food web.

  Which of the statements given above is/are correct
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  1 and 2             done clear
  D)
  None of the Above done clear
  View Solution play_arrow

• question_answer113)
  Water in a wetland can be

  1. Fresh

  2. Brackish

  3. Static

  Select the correct answer using the codes given below.
  A)
  1 and 2             done clear
  B)
  1 and 3 done clear
  C)
  2 and 3             done clear
  D)
  1, 2 and 3 done clear
  View Solution play_arrow

• question_answer114)
  Consider the following statement related to humidity

  1. Specific humidity

  2. Absolute humidity

  3. Relative humidity

  4. Non relative humidity

  Which among the following is not the type of humidity?
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  4 only done clear
  View Solution play_arrow

• question_answer115)
  Consider the following statement

  1. Steppe is found in low latitudes and middle latitudes.

  2. Prairies are humid and densely covered tall grasslands

  3. Savanna are the areas of thick high grasses

  Choose the correct code
  A)
  1 only               done clear
  B)
  2 only done clear
  C)
  3 only               done clear
  D)
  1, 2, 3 done clear
  View Solution play_arrow

• question_answer116)
  On which of the following can you find the Bureau of Energy Efficiency Star Label?    (IAS Prelims 2016)

  1. Ceiling fans

  2. Electric geysers

  3. Tubular fluorescent lamps

  Select the correct answer using the code given below.
  A)
  1 and 2 only                  done clear
  B)
  3 only done clear
  C)
  2 and 3 only                  done clear
  D)
  1, 2 and 3 done clear
  View Solution play_arrow