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The survival of a species is… (Class 10 Science 2024, Q24)

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ScienceCBSE Class 10 · Board exam 2024, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2024: question 24

Set in the CBSE Class 10 board exam of 2024, paper 31/4/1, section B, question 24, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q24 · 2 marks · Very short answerHeredity

The survival of a species is promoted through creation of variations. Illustrate with an example.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/4/1.

Hints

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

Hint 1

Think of what happens to a population when the environment suddenly changes.

Hint 2

Use the NCERT example of bacteria and rising water temperature.

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. Variations arise during reproduction, so the individuals of a population are not all identical. Some of them may carry a variation that helps them cope with a changed environment.

    1 mark

  2. Example: in a population of bacteria living in temperate water, suppose a few bacteria have a variation that lets them tolerate heat. If the water temperature rises sharply (for example in a heat wave due to global warming), most bacteria die but the heat-resistant variants survive and reproduce. In this way the species survives, so variation promotes its survival.

    1 mark

Answer: Example: heat-tolerant variant bacteria survive a rise in water temperature while the others die, so the species continues.

Where the marks are

  • States that variations help some individuals survive changed conditions (1 mark)
  • Gives a suitable example, such as heat-resistant bacteria surviving a heat wave (1 mark)

Revise the chapter

  • Chapter: Heredity (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Heredity, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/4/1: 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.