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Organisms and Populations

21 NEET questions on Organisms and Populations. A sample is shown below with full explanations; the rest are available free after signing up.

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Organisms and Populations2026medium

Q1.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 ______.

  • A1 million
  • B5 million
  • C10 millionAnswer
  • D100 million

Explanation

Population growth follows dN/dt = (b − d)N. Here b and d are equal, so the intrinsic rate of natural increase r is zero and dN/dt = 0. The population therefore stays at 10 million no matter how many generations pass.

Source: NEET 2026 re-exam (21 June), Code 50, Q161

Organisms and Populations2026easy

Q2.Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  • Assertion A: The logistic growth model of populations is considered more realistic than the exponential growth model.
  • Reason R: Resources are finite.
  • ABoth A and R are correct and R is the correct explanation of AAnswer
  • BBoth A and R are correct but R is not the correct explanation of A
  • CA is correct but R is not correct
  • DA is not correct but R is correct

Explanation

Exponential growth assumes unlimited resources and would continue forever, which no real population does. The logistic model introduces a carrying capacity precisely because resources are finite — so the reason is not merely also true, it is the whole justification for the assertion.

Source: NEET 2026 re-exam (21 June), Code 50, Q163

Organisms and Populations2026easy

Q3.Match List-I with List-II. Choose the correct answer from the options given below:

  • 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
  • I. Predation
  • II. Mutualism
  • III. Competition
  • IV. Commensalism
  • AA-III, B-IV, C-II, D-I
  • BA-I, B-II, C-III, D-IV
  • CA-II, B-I, C-IV, D-III
  • DA-III, B-I, C-II, D-IVAnswer

Explanation

Interactions are classified by the sign of the effect on each partner. Both harmed is competition; one harmed and one benefited is predation; both benefited is mutualism; one benefited with the other unaffected is commensalism.

Source: NEET 2026 re-exam (21 June), Code 50, Q174

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Questions are reformatted from NEET previous year papers with original explanations and topic tagging. NEET Prep is not affiliated with the NEET examining body.