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Organisms and Populations: Class-XII


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NEET PYQs on Organisms and Populations: Class-XII


Given below are two statements:
Statement I: Gause's "Competitive Exclusive Principle" states that two closely related species competing for the same related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II: In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:

NEET-2023 [Organisms-and-Populations] [class-xii ]

  • Statement I is incorrect but Statement II is true
  • Both Statement I and Statement II are true
  • Both Statement I and Statement II are false
  • Statement I is correct but Statement II is false.
    • Correct Option: D  [ Statement I is correct but Statement II is false. ]

    Remark:

Match List-I with List-II

List-I (Interaction) List-II (Species A and B)
(A)Mutualism (I)+(A), O(B)
(B)Commensalism (II)–(A), O(B)
(C)Amensalism (III)+(A), -(B)
(D)Parasitism (IV)+(A), +(B)
Choose the correct answer from the given options:

NEET-2023 [Organisms-and-Populations] [class-xii ]

  • A-III, B-I, C-IV, D-II
  • A-IV, B-II, C-I, D-III
  • A-IV, B-I, C-II, D-III
  • A-IV, B-III, C-I, D-II
    • Correct Option: C  [ A-IV, B-I, C-II, D-III ]

    Remark:

Match List-I with List-II.

List-I (Interacting species) List-II (Name of Interaction)
(A)A Leopard and a Lion in a forest/ grassland (I)Competition
(B)A Cuckoo laying egg in a Crow's nest (II)Brood parasitism
(C)Fungi and root of a higher plant in Mycorrtizae (III)Mutualism
(D)A cattle egret and a Cattle in a field (IV)Commensalism
Choose the correct answer from the options given below:

NEET-2023 [Organisms-and-Populations] [class-xii ]

  • A-II, B-III, C-I, D-IV
  • A-I, B-II, C-III, D-IV
  • A-I, B-II, C-IV, D-III
  • A-III, B-IV, C-I, D-II
    • Correct Option: B  [ A-I, B-II, C-III, D-IV ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Logistic growth (I)Unlimited resource availability condition
(B)Exponential growth (II)Limited resource availability condition
(C)Expanding age pyramid (III)The percent individuals of pre-reproductive age is largest followed by reproductive and post reproductive age groups
(D)Stable age pyramid (IV)The percent individuals of pre-reproductives and reproductive age group are same
Choose the correct answer from the options given below:

NEET-2023 [Organisms-and-Populations] [class-xii ]

  • A-II, B-IV, C-III, D-I
  • A-II, B-I, C-III, D-IV
  • A-II, B-III, C-I, D-IV
  • A-II, B-IV, C-I, D-III
    • Correct Option: B  [ A-II, B-I, C-III, D-IV ]

    Remark:

Which one of the following statements cannot be connected to Predation?

NEET-2022 [Organisms-and-Populations] [class-xii ]

  • It helps in maintaining species diversity in a community
  • It might lead to extinction of a species
  • Both the interacting species are negatively impacted
  • It is necessitated by nature to maintain the ecological balance
    • Correct Option: C  [ Both the interacting species are negatively impacted ]

    Remark:

If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ___________ individuals per Drosophila per week.

NEET-2022 [Organisms-and-Populations] [class-xii ]

  • 10
  • 1.0
  • zero
  • 0.1
    • Correct Option: D  [ 0.1 ]

    Remark:

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

NEET-2021 [Organisms-and-Populations] [class-xii ]

  • Resource partitioning
  • Competitive release
  • Mutualism
  • Predation
    • Correct Option: A  [ Resource partitioning ]

    Remark:

Amensalism can be represented as:

NEET-2021 [Organisms-and-Populations] [class-xii ]

  • Species A (–); Species B (0)
  • Species A (+); Species B (+)
  • Species A (–); Species B (–)
  • Species A (+); Species B (0)
    • Correct Option: A  [ Species A (–); Species B (0) ]

    Remark:

In the exponential growth equation
Nt = N0ert, e represents:

NEET-2021 [Organisms-and-Populations] [class-xii ]

  • The base of number logarithms
  • The base of exponential logarithms
  • The base of natural logarithms
  • The base of geometric logarithms
    • Correct Option: C  [ The base of natural logarithms ]

    Remark:

Match List-I with List-II.

List-I List-II
(A)Allen's Rule (I)Kangaroo rat
(B)Physiological adaptation (II)Desert lizard
(C)Behavioural adaptation (III)Marine fish at depth
(D)Biochemical adaptation (IV)Polar seal
Choose the correct answer from the options given below:

NEET-2021 [Organisms-and-Populations] [class-xii ]

  • A-IV, B-I, C-III, D-II
  • A-IV, B-I, C-II, D-III
  • A-IV, B-III, C-II, D-I
  • A-IV, B-II, C-III, D-I
    • Correct Option: B  [ A-IV, B-I, C-II, D-III ]

    Remark:
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