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Name the term used for the… (Class 10 Science 2024, Q26)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 26

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section B, question 26, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q26 · 2 marks · Very short answerOur Environment

Name the term used for the materials which cannot be broken down by biological processes. Give two ways by which they harm various components of an ecosystem.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

Think of the opposite of 'biodegradable'.

Hint 2

What happens to plastic or DDT if decomposers cannot act on it, and what happens along a food chain?

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. Materials that cannot be broken down by biological processes (by decomposers such as bacteria and fungi) are called non-biodegradable substances, for example plastics and DDT.

    1 mark

  2. Harm 1: They are inert, so they stay in the environment for a long time and pollute the soil, water and air.

    ½ mark

  3. Harm 2: Harmful non-biodegradable chemicals enter food chains and build up at each trophic level (biological magnification). Another harm is that they lower soil fertility. Any two of these are enough.

    ½ mark

Answer: Non-biodegradable substances; they persist and pollute the environment, and they cause biological magnification (or reduce soil fertility).

Where the marks are

  • Names non-biodegradable substances (1 mark)
  • Any two correct harms, e.g. persistence and pollution, biomagnification, loss of soil fertility (½ + ½ mark)

Revise the chapter

  • Chapter: Our Environment (notes, formulas, where marks are lost and every past question)
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 31/2/1: 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.