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Class XII · Biology

Organisms and Populations: NEET MCQ practice

255 practice questions on Organisms and Populations, including 33 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

255

Practice questions

159

Easy

95

Medium

1

Hard

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What Organisms and Populations covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Organisms and environment
  • Population interactions- mutualism, competition, predation, parasitism
  • Population attributes- growth, birth rate and death rate, age distribution

Past NEET questions on Organisms and Populations

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

Epiphytes that are growing on a mango branch is an example of which of the following?

  1. A.Commensalism
  2. B.Mutualism
  3. C.Predation
  4. D.Amensalism
Show answer

Answer: A. Commensalism

Epiphytes grow on branches for physical support without harming or benefiting the host tree—a classic commensalism relationship.

Question 2 · NEET 2025

Which one of the following equations represents the Verhulst-Pearl Logistic Growth of population?

  1. A.–       dN K N r dt K
  2. B.–        dN K N rN dt K
  3. C.–        dN N K rN dt N
  4. D.–        dN r K N dt K ■■■
Show answer

Answer: B. –        dN K N rN dt K

The differential form of the logistic growth curve is dN/dt = rN(1 – N/K). This expands to dN/dt = rN(K – N)/K. Comparing with options, the correct expression matches (B) dN/dt = rN((K – N)/K).

Question 3 · NEET 2024

Match List-I with List-II: List I List II A. Predator I. Ophrys B. Mutualism II. Pisaster C. Parasitism III. Female wasp and fig D Sexual deceit IV. Plasmodium Chose the correct answer from the options given below:

  1. A.A-III, B-II, C-I, D-IV
  2. B.A-IV, B-I, C-II, D-III
  3. C.A-II, B-III, C-I, D-IV
  4. D.A-II, B-III, C-IV, D-I
Show answer

Answer: D. A-II, B-III, C-IV, D-I

Ophrys mimics female bee for pollination → sexual deceit (D-I). Pisaster is a starfish predator (A-II). Female wasp and fig show mutualism (B-III). Plasmodium causes malaria → parasite (C-IV). Matches column mapping.

Question 4 · NEET 2024

Match List-I with List-II: List I List II A. Gene pool I. Stable within a generation B. Genetic drift II. Change in gene frequency by chance C. Gene flow III. Transfer of genes into or out of population D Gene frequency IV. Total number of genes and their alleles Choose the correct answer from the options given below:

  1. A.A-III, B-II, C-I, D-IV
  2. B.A-IV, B-II, C-III, D-I
  3. C.A-I, B-II, C-III, D-IV
  4. D.A-II, B-III, C-IV, D-I
Show answer

Answer: B. A-IV, B-II, C-III, D-I

Gene pool is total genes/alleles in a population (IV). Genetic drift is change in allele frequency by chance (II). Gene flow is transfer of genes between populations (III). Gene frequency is the proportion of an allele, stable within a generation (I).

Question 5 · NEET 2024

When will the population density increase, under special conditions? When the number of:

  1. A.Deaths exceeds number of births and also number of emigrants equals number of immigrants.
  2. B.Births plus number of immigrants equals number of deaths plus number of emigrants.
  3. C.Births plus number of emigrants is more than the number of deaths plus number of immigrants.
  4. D.Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.
Show answer

Answer: D. Births plus number of immigrants is more than the sum of number of deaths and number of emigrants.

Population density increases when population grows. Population change = (Births + Immigrants) − (Deaths + Emigrants). Density rises if births + immigrants > deaths + emigrants.

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