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"Plants use a variety of… (Class 10 Science 2025, Q23)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 2 marks · Very short answer

CBSE Class 10 Science 2025: question 23

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section B, question 23, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23 · 2 marks · Very short answerLife Processes

"Plants use a variety of techniques to get rid of waste material." Justify this statement giving any four ways.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Think of gases, water and solid wastes separately.

Hint 2

Recall what happens to old leaves and old xylem, and where cell wastes can be stored.

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. Oxygen produced in photosynthesis is given out as a waste through the stomata.

    ½ mark

  2. Excess water is removed by transpiration.

    ½ mark

  3. Many wastes collect in old leaves, which are then shed.

    ½ mark

  4. Some wastes are stored as resins and gums, especially in old xylem. Other possible points: wastes are stored in cell vacuoles, or excreted into the soil around the roots.

    ½ mark

Answer: Oxygen through stomata, excess water by transpiration, shedding of leaves, and storage as resins and gums in old xylem (also storage in vacuoles or excretion into the soil).

Where the marks are

  • Any four correct ways of removing plant waste, for example O₂ through stomata, transpiration, leaf fall, resins and gums in old xylem, storage in vacuoles, excretion into the soil (½ mark each × 4 = 2 marks)

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 paper2025 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.