Organisms and Populations NEET PYQs (1988–2026)

Solved Organisms and Populations PYQs

3 recent questions with answers. The full set of 109 is free to practise.

1. NEET 2026EasyResponses to abiotic factors (adaptations)
   Q1

   Heterophyllous development in response to environment is an example of which of the following phenomena?

   • ARedifferentiation
   • BElasticity
   • CDedifferentiation
   • DPlasticity

   Show answer & solution

   Correct answer: (D)

   Heterophylly is an example of plasticity.
2. NEET 2026EasyPopulation attributes and growth models
   Q2

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

   • A$\frac{dN}{dt}=rN\left(\frac{K+N}{K}\right)$
   • B$\frac{dN}{dt}=rN\left(\frac{K-N}{K}\right)$
   • C$\frac{dN}{dt}=rN\left(\frac{K-N}{K}\right)$
   • D$\frac{dN}{dt}=rN\left(\frac{K+N}{K}\right)$

   Show answer & solution

   Correct answer: (B)

   Logistic growth:
   
   $\frac{dN}{dt}=rN\left(1-\frac{N}{K}\right)=rN\left(\frac{K-N}{K}\right)$.
3. NEET 2026HardParasitism, commensalism, and mutualism
   Q3

   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:

   • AB and E only
   • BA and B only
   • CB, D and E only
   • DA and D only

   Show answer & solution

   Correct answer: (C)

   A false (commensalism: one benefits, other unaffected). B true. C false. D true. E true. So B, D, E.

Topic-wise question count

Where NEET has asked from Organisms and Populations, most frequent first.

• Parasitism, commensalism, and mutualism24
• Organism and its environment (abiotic factors)24
• Population attributes and growth models23
• Population interactions: predation and competition18
• Responses to abiotic factors (adaptations)14
• Age pyramids and population growth regulation6

Year-wise Organisms and Populations questions in NEET

Number of questions from this chapter in each year's paper(s).