Skip to content

Why do organic farmers not… (Class 12 Biology 2024, Q20b)

questionbuddy.in/q/cbse-12-biology-2024-57-1-1-q20b-organic-farmers-not-recommend-complete

BiologyCBSE Class 12 · Board exam 2024, set 57/1/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2024: question 20(b)

Set in the CBSE Class 12 board exam of 2024, paper 57/1/1, section B, question 20(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q20(b) · 2 marks · Very short answerCompetency-basedEcosystem

Why do organic farmers not recommend complete eradication of insect pests ? Explain giving reason.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/1/1.

Hints

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

Hint 1

Think of food chains on a farm: who eats the pests?

Hint 2

What would happen to ladybirds and dragonflies if all their prey disappeared?

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. Organic farmers believe that complete eradication of pests is not only impossible but also undesirable. Their aim is to keep pests at manageable levels through a balanced, holistic system.

    1 mark

  2. Reason: Beneficial predatory and parasitic insects depend on the pests as food or hosts, so they cannot survive without them. Organic farmers also hold that biodiversity furthers health: the greater the biodiversity, the more sustainable the ecosystem.

    1 mark

Answer: Complete eradication is undesirable because beneficial predators and parasites depend on pests as food/hosts; biodiversity keeps the ecosystem healthy and sustainable.

Where the marks are

  • States eradication is undesirable; pests are to be controlled, not eliminated (1 mark)
  • Reason: predators and parasites need pests as food/hosts; biodiversity gives a sustainable ecosystem (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Ecosystem, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/1/1: 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.