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Biology

Ecosystem

A Biology chapter of the NEET syllabus, and how to practise it for the computer-based exam.

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

Ecosystem carried 5 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 Ecosystem, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

Which of the following statements are Correct ? Statement I: Energy flow from producers to consumers is unidirectional Statement II: Energy pyramid can never be inverted Statement III: Transfer of energy follows the 1% law Choose the correct answer from the options given below :
  1. A.(I), (II) and (III)
  2. B.(I) and (II) only
  3. C.(I) and (III) only
  4. D.(II) and (III) only
Answer and explanation

Answer: B

Energy enters an ecosystem as sunlight and moves in one direction only, from producers to successive consumer levels, being lost as heat at each step - it is never recycled the way nutrients are, so (Statement I) is correct. Because of that unavoidable loss, each level holds less energy than the one below it, so the pyramid of energy is ALWAYS upright and can never be inverted, making (Statement II) correct. Statement III misquotes Lindeman's rule, which is the 10 PER CENT law, not 1 per cent. NCERT Class 12, Ecosystem.

Question 2 · NEET 2026

Which of the following are primary consumers in a food chain?
  1. A.Parasites
  2. B.Predators
  3. C.Herbivores
  4. D.Carnivores
Answer and explanation

Answer: C

Primary consumers occupy the second trophic level and feed directly on the producers, which makes them by definition the herbivores. Carnivores that eat herbivores are secondary consumers at the third trophic level, and those that eat secondary consumers are tertiary. NCERT Class 12, Ecosystem.

How to practise Ecosystem

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 NEET mini mock with answers.

Nearby Biology chapters

Questions

How many questions did Ecosystem have in NEET 2026?

Ecosystem carried 5 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Ecosystem PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Ecosystem 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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