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Plants → Deer → Lion In the… (Class 10 Science 2024, Q33A)

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ScienceCBSE Class 10 · Board exam 2024, set 31/1/1 · 3 marks · Short answer

CBSE Class 10 Science 2024: question 33(A)

Set in the CBSE Class 10 board exam of 2024, paper 31/1/1, section C, question 33(A), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q33(A) · 3 marks · Short answerCompetency-basedOur Environment

Plants Deer Lion
In the given food chain, what will be the impact of removing all the organisms of second trophic level on the first and third trophic level? Will the impact be the same for the organisms of the third trophic level in the above food chain if they were present in a food web? Justify.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/1/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

What eats the plants, and what do the lions eat?

Hint 2

In a food web, a carnivore has several possible prey. How does that change things?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. First trophic level: with no deer to eat them, the number of plants will increase.

    1 mark

  2. Third trophic level: the lions will decrease in number (they may die) because they lose their only food.

    1 mark

  3. No, the impact would not be the same in a food web.

    ½ mark

  4. Justification: in a food web the lions have alternative prey (other herbivores) to feed on, so they would not starve. Food webs are therefore more stable.

    ½ mark

Answer: Plants increase; lions decrease; no, in a food web lions find alternative food

Where the marks are

  • Plants (first trophic level) increase (1 mark)
  • Lions (third trophic level) decrease (1 mark)
  • Impact not the same (½ mark)
  • Alternative food sources available in a food web (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Our Environment, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/1/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.