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Explain in brief two ways by… (Class 10 Science 2023, Q23b)

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ScienceCBSE Class 10 · Board exam 2023, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2023: question 23(b)

Set in the CBSE Class 10 board exam of 2023, paper 31/5/1, section B, question 23(b), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23(b) · 2 marks · Very short answerLife Processes

Explain in brief two ways by which leaves of a plant help in excretion.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/5/1.

Hints

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

Hint 1

Through which tiny pores do leaves exchange gases and lose water?

Hint 2

Think of the waste gas produced during photosynthesis.

Hint 3

Old leaves fall off. What could they carry away with them?

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. (1) Transpiration: the leaves lose excess water as water vapour through their stomata, which removes the extra water from the plant.

    1 mark

  2. (2) Removal of gaseous wastes: oxygen produced as a by-product of photosynthesis (and from respiration) diffuses out through the stomata. Also accepted: waste products stored in old leaves are removed when those leaves are shed.

    1 mark

Answer: Leaves remove excess water by transpiration and give out waste oxygen through stomata (wastes are also stored in leaves that are shed)

Where the marks are

  • Excess water removed through transpiration (1 mark)
  • Waste oxygen given out through stomata, or wastes lost by shedding of leaves (1 mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paper2023 board paper, set 31/5/1: 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.