CUET (UG) Biology 2023- Organisms and Environment mock test

CUET biology mock test of chapter organisms and environment is provided here . Practice the Biology MCQs with answer of chapter organisms and environment suitable undergraduate exam of CUET. Learn and practice Biology questions and answers of chapter organisms and environment . Biology MCQ questions with answers for CUET are very helpful for your exam.

CUET (UG) Biology 2023- Organisms and Environment mock test
CUET (UG) Biology 2023- Organisms and Environment mock test

CUET is a Common University Entrance Test that is now mandatory to take admission to Central Universities in India. CUET Biology Mock questions of chapter organisms and environment are based on the latest CUET exam pattern and also helpful for other entrance exams, so that you can have a fair idea about exam trends that will be followed for CUET entrance exams.

Organisms and Environment Biology MCQs for CUET :

  1. Identify the basic levels of ecology.
    I. Organisms II. Populations
    III. Communities IV. Biomes
    V. Human VI. Vertebrates
    Choose the correct option.

    (a) I, II and III
    (b) II, III and VI
    (c) I, II, III and IV
    (d) I, II, III and V
  2. Different organisms are adapted to their environment in terms of not only survival but also reproduction. This statement belongs to
    (a) physiological ecology (b) species ecology
    (c) population ecology (d) All of these
  3. Formation of major biomes such as desert, rainforest takes place by
    (a) rotation of our planet around the sun
    (b) tilting of our planet to its axis
    (c) Both (a) and (b)
    (d) seasonal periodicity
  1. Environmental factor(s) that characterise the habitat of an organism is/are
    (a) abiotic components
    (b) biotic components
    (c) Both (a) and (b)
    (d) temperature only
  2. The key elements that lead to large variations in the physical and chemical conditions of different habitats are
    (a) the physico-chemical (abiotic) components
    (b) the biotic components like pathogens, parasites, predators and competitors
    (c) Both (a) and (b)
    (d) None of the above
  3. Temperature is very significant to the living beings because
    (a) kinetics of locomotion depend on temperature
    (b) kinetics of enzymes depend on temperature
    (c) high temperature facilitates digestion
    (d) low temperature facilitates digestion
  4. The organism which tolerates wide range of salinity called …A… . The organism which tolerates narrow range of salinity called …B… . Choose the correct option for A and B.
    (a) A–stenohaline, B–euryhaline
    (b) A–euryhaline, B–stenohaline
    (c) A–isohaline, B–euryhaline
    (d) A–heterohaline, B–isohaline
  5. Many fishes of freshwater cannot live in sea water and vice-versa because of
    (a) nutrient (b) osmotic problems
    (c) breathing problems (d) excretion problems
  1. Sunlight is available as a source of energy and is important in
    (a) chemosynthesis
    (b) photosynthesis
    (c) heterotrophic mode of nutrition
    (d) All of the above
  2. In aquatic environment, the types of benthic animals are determined by
    (a) type of water
    (b) type of sediment characteristics
    (c) light availability
    (d) nutrient availability
  1. Regulators are also called
    (a) endotherms (b) exotherms
    (c) ectotherms (d) Either (b) or (c)
  2. Partial regulators are the organisms which
    (a) can regulate body temperature to larger extent of environmental condition
    (b) can regulate body temperature to limited extent of environmental condition
    (c) can regulate body temperature only over a wide range of environmental condition
    (d) None of the above
  3. Conformers are inactive in adverse conditions due to
    (a) inability to move
    (b) inability to digest properly
    (c) inability to maintain homeostasis
    (d) ability to maintain homeostasis
  1. Diapause is a
    (a) stage of development
    (b) stage of suspended development
    (c) stage of delayed morphology
    (d) rapid developmental stage
  2. In the absence of an external source of water, Kangaroo rat in North American desert is capable of meeting all its water requirements through
    (a) internal fat oxidation (b) taking liquid food
    (c) reducing his activities (d) hibernation
  3. An adaptation in Opuntia is that, it performs photosynthesis by
    (a) flower (b) stem
    (c) roots (d) shoot
  4. At high altitude, we feel sick and nauseated. The reason for this sickness may be
    (a) low atmospheric pressure
    (b) high atmospheric pressure
    (c) high temperature
    (d) low temperature
  5. Which of the following problems does the frequent deep sea diving organisms like whales may face?
    (a) Compression of tissues surrounding air-filled cavities
    (b) High blood nitrogen levels
    (c) Lack of oxygen
    (d) All of the above
  6. Population is the total number of
    (a) interbreeding individuals of a species found in a geographical area
    (b) interbreeding individuals of a species found in different geographical area
    (c) Both (a) and (b)
    (d) None of the above
  7. If birth rate is 100, death rate is 10 and number of individuals in population group is 1000, then what will be the percentage of natural growth rate?
    (a) 0.09% (b) 9.0%
    (c) 0.9% (d) 90%
  8. Bell-shaped age pyramid indicates that
    (a) number of pre-reproductive and reproductive individual is almost equal
    (b) post-reproductive individuals are comparatively fewer
    (c) the population size remains stable
    (d) All of the above
  1. Zero growth of population is indicated by
    (a) less number of childbirth
    (b) less number of reproductive females
    (c) reproductive individuals are equal to pre-reproductive individuals
    (d) less number of males than females
  2. Which of the following is not an example of using relative density to measure population density in a certain area?
    (a) Counting pugmarks of tigers to find population density of tigers in a forest
    (b) Counting the number of fishes caught in a trap to find population density of fishes in a lake
    (c) Measuring biomass of bacterial culture to find out population density of bacteria in a petri dish
    (d) Both (a) and (c)
  1. Interspecific interactions arise from the interaction of
    (a) population of two different species
    (b) population of same species
    (c) two individuals of same species
    (d) two individuals of different area
  2. Interspecific interaction could be
    (a) beneficial (b) detrimental
    (c) neutral (d) All of these
  3. The population interaction in which free-living organism that catches, kills and devours individuals of other species called prey is called
    (a) parasitism (b) predation
    (c) amensalism (d) commensalism
  4. Exotic species sometimes become invasive and starts spreading fast because of
    (a) natural predators
    (b) abundant natural competitor
    (c) invaded land not having its natural predators
    (d) mutation in their genome
  1. Which of the following is not an example of prey-predator relationship?
    (a) Tiger eating deer
    (b) Plant Nepenthes trapping an insect
    (c) Bacteria decomposing organic matter
    (d) Crocodile killing a man
  2. Species facing competition might evolve mechanism that promotes coexistence rather than exclusion. One such mechanism is
    (a) competitive release (b) resource partitioning
    (c) coevolution (d) None of the above
  1. Mycorrhiza represents an intimate mutualistic relationship between
    (a) fungi and stem of higher plants
    (b) fungi and roots of higher plants
    (c) fungi and leaves of higher plants
    (d) fungi and leaflets of higher plants

Organisms and Environment Mcqs answers for CUET :

Question no.AnswerQuestion no.AnswerQuestion no.Answer
1(c)11(a)21(d)
2(a)12(b)22(c)
3(c)13(c)23(d)
4(c)14(b)24(a)
5(c)15(a)25(d)
6(b)16(b)26(b)
7(b)17(a)27(c)
8(b)18(d)28(c)
9(b)19(a)29(b)
10(b)20(b)30(b)

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