NEET Organisms and Populations PYQ practice sheet

20 previous-year NEET Botany questions from Organisms and Populations, newest papers first. Organisms and Populations carries 22 of the Botany questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   Consider a population of 10 million cells. Given the per-capita birth rate of 0.002 (per unit time) and the per-capita death rate of 0.002 (per unit time), the expected number of cells after 10 generations is ______.

   • (A)
     10 million
   • (B)
     5 million
   • (C)
     100 million
   • (D)
     1 million
2. 2.

   RE-NEET 2026

   Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : The logistic growth model of populations is considered more realistic than the exponential growth model. Reason R : Resources are finite. In the light of the above statements, choose the most appropriate answer from the options given below :

   • (A)
     Both A and R are correct and R is the correct explanation of A
   • (B)
     Both A and R are correct but R is not the correct explanation of A
   • (C)
     A is correct but R is not correct
   • (D)
     A is not correct but R is correct
3. 3.

   RE-NEET 2026

   Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced. Reason R : Goats were more efficient at browsing than Abingdon tortoise. In the light of the above statements, choose the most appropriate answer from the options given below:

   • (A)
     Both A and R are correct and R is the correct explanation of A
   • (B)
     Both A and R are correct but R is not the correct explanation of A
   • (C)
     A is correct but R is not correct
   • (D)
     A is not correct but R is correct
4. 4.

   RE-NEET 2026

   Match List-I with List-II. List-I: A. Both species are harmed B. One species is harmed and the other is benefited C. Both species are benefited D. One is benefited while the other has no effect List-II: I. Predation II. Mutualism III. Competition IV. Commensalism Choose the correct answer from the options given below:

   • (A)
     A-I, B-II, C-III, D-IV
   • (B)
     A-III, B-I, C-II, D-IV
   • (C)
     A-III, B-IV, C-II, D-I
   • (D)
     A-II, B-I, C-IV, D-III
5. 5.

   NEET 2026

   Which of the following equations depicts Verhulst-Pearl logistic population growth?

   • (A)
     $\dfrac{dN}{dt}=rN\left[\dfrac{K-N}{N}\right]$
   • (B)
     $\dfrac{dN}{dt}=rN\left[\dfrac{K-N}{K}\right]$
   • (C)
     $\dfrac{dN}{dt}=rN\left[\dfrac{K+N}{K}\right]$
   • (D)
     $\dfrac{dN}{dt}=rN\left[\dfrac{K}{K-N}\right]$
6. 6.

   NEET 2026

   Which one of the following is an appropriate example of sexual deceit?

   • (A)
     Sea anemone and clown fish
   • (B)
     Ophrys and bumblebee
   • (C)
     Cuckoo and crow
   • (D)
     Female wasp and fig
7. 7.

   NEET 2026

   Choose the correct statements regarding population interactions between two species. A. In both parasitism and commensalism, only one species benefits and the other species is harmed. B. Both species benefit in mutualism. C. Both species benefit in commensalism. D. In parasitism, only one species benefits and the other species is harmed. E. In amensalism, one species is harmed and the other is unaffected. Choose the correct answer from the options given below:

   • (A)
     B, D and E only
   • (B)
     A and D only
   • (C)
     B and E only
   • (D)
     A and B only
8. 8.

   NEET 2024

   The equation of Verhulst-Pearl logistic growth is $\dfrac{dN}{dt}=rN\left[\dfrac{K-N}{K}\right]$. From this equation, $K$ indicates:

   • (A)
     Carrying capacity
   • (B)
     Intrinsic rate of natural increase
   • (C)
     Biotic potential
   • (D)
     Population density
9. 9.

   NEET 2024

   Given below are two statements: Statement I: Gause's competitive exclusive principle states that two closely related species competing for different resources cannot exist indefinitely. Statement II: According to Gause's principle, during competition, the inferior will be eliminated. This may be true if resources are limiting. In the light of the above statements, choose the most appropriate answer from the options given below:

   • (A)
     Statement I is true but Statement II is false.
   • (B)
     Both statement I and Statement II are true.
   • (C)
     Statement I is false but statement II is true.
   • (D)
     Both statement I and Statement II are false.
10. 10.

    NEET 2023

    Given below are two statements : Statement I : Gause's 'Competitive Exclusion Principle' states that two closely 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 :

    • (A)
      Statement I is incorrect but Statement II is true.
    • (B)
      Both Statement I and Statement II are true.
    • (C)
      Both Statement I and Statement II are false.
    • (D)
      Statement I is true but Statement II is false.
11. 11.

    NEET 2023

    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 options given below :

    • (A)
      A-III, B-I, C-IV, D-II
    • (B)
      A-IV, B-II, C-I, D-III
    • (C)
      A-IV, B-I, C-II, D-III
    • (D)
      A-IV, B-III, C-I, D-II
12. 12.

    NEET 2023

    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 Mycorrhizae | III. Mutualism | | D. A cattle egret and a Cattle in a field | IV. Commensalism | Choose the correct answer from the options given below:

    • (A)
      A-II, B-III, C-I, D-IV
    • (B)
      A-I, B-II, C-III, D-IV
    • (C)
      A-I, B-II, C-IV, D-III
    • (D)
      A-III, B-IV, C-I, D-II
13. 13.

    NEET 2023

    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:

    • (A)
      A-II, B-IV, C-III, D-I
    • (B)
      A-II, B-I, C-III, D-IV
    • (C)
      A-II, B-III, C-I, D-IV
    • (D)
      A-II, B-IV, C-I, D-III
14. 14.

    NEET 2022

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

    • (A)
      It is necessitated by nature to maintain the ecological balance
    • (B)
      It helps in maintaining species diversity in a community
    • (C)
      It might lead to extinction of a species
    • (D)
      Both the interacting species are negatively impacted
15. 15.

    NEET 2022

    While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (−) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (−) for another species involved in the interaction?

    • (A)
      Competition
    • (B)
      Predation
    • (C)
      Amensalism
    • (D)
      Commensalism
16. 16.

    NEET 2021

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

    • (A)
      Predation
    • (B)
      Competitive release
    • (C)
      Mutualism
    • (D)
      Resource partitioning
17. 17.

    NEET 2021

    In the exponential growth equation $N_t = N_0e^{rt}$, $e$ represents :

    • (A)
      The base of exponential logarithms
    • (B)
      The base of number logarithms
    • (C)
      The base of geometric logarithms
    • (D)
      The base of natural logarithms
18. 18.

    NEET 2021

    Assertion (A) : A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. In the light of the above statements, choose the correct answer from the options given below.

    • (A)
      (A) is false but (R) is true
    • (B)
      (A) is true but (R) is false
    • (C)
      Both (A) and (R) are true and (R) is the correct explanation of (A)
    • (D)
      Both (A) and (R) are true but (R) is not the correct explanation of (A)
19. 19.

    NEET 2021

    Choose the correct answer from the options given below.

    • (A)
      (a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
    • (B)
      (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
    • (C)
      (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
    • (D)
      (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
20. 20.

    NEET 2020

    Which of the following is not an attribute of a population?

    • (A)
      Sex ratio
    • (B)
      Natality
    • (C)
      Mortality
    • (D)
      Species interaction