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Biology

Organisms and Populations

Population attributes, exponential and logistic growth, and interactions like mutualism, competition, predation, and parasitism form the core here. Growth equations and graphs get tested alongside recall, so know the logistic curve and each interaction's sign pair.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Organisms and Populations carried 3 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Organisms and Populations, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

Which one of the following is an appropriate example of sexual deceit?
  1. A.Female wasp and fig
  2. B.Ophrys and bumblebee
  3. C.Sea anemone and clown fish
  4. D.Cuckoo and crow
Answer and explanation

Answer: B

In sexual deceit the Mediterranean orchid Ophrys mimics a female bumblebee so that the male bee attempts pseudocopulation and inadvertently pollinates the flower. Female wasp and fig is mutualism, sea anemone and clown fish is commensalism, and cuckoo and crow is brood parasitism, so only Ophrys and bumblebee is sexual deceit.

Question 2 · NEET 2026

Which of the following equations depicts Verhulst-Pearl logistic population growth?
  1. A.dNdt=rN(K+NK)\frac{dN}{dt} = rN\left(\frac{K+N}{K}\right)
  2. B.dNdt=rN(K−NK)\frac{dN}{dt} = rN\left(\frac{K-N}{K}\right)
  3. C.dNdt=rN(K−NN)\frac{dN}{dt} = rN\left(\frac{K-N}{N}\right)
  4. D.dNdt=rN(KK−N)\frac{dN}{dt} = rN\left(\frac{K}{K-N}\right)
Answer and explanation

Answer: B

The Verhulst-Pearl logistic growth equation is dNdt=rN(K−NK)\frac{dN}{dt}=rN\left(\frac{K-N}{K}\right), where K is the carrying capacity, r is the intrinsic rate of natural increase and N is the population density at time t. The term (K-N)/K represents environmental resistance, so option 2 is correct.

How to practise Organisms and Populations

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free 12-question mock on the exam screen.

Nearby Biology chapters

Questions

How many questions did Organisms and Populations have in NEET 2026?

Organisms and Populations carried 3 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Organisms and Populations PYQs for NEET?

In the BrainIt app, free until the 2027 exam: its bank holds 50,000 past NTA questions tagged to all 83 chapters, including this one, with accuracy tracked per chapter. Sample questions from this chapter are on this page.

Is Organisms and Populations important for NEET 2027?

It is part of the Biology syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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