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Give reasons for the following: (Class 10 Science 2026, Q13)

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ScienceCBSE Class 10 · Board exam 2026, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2026: question 13

Set in the CBSE Class 10 board exam of 2026, paper 31/4/1, section A, question 13, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q13 · 3 marks · Short answerControl and Coordination

Give reasons for the following:

  1. (a)

    Adrenal gland is known as the stress gland of the body.

    0 marks
  2. (b)

    Prenatal sex determination is banned in India.

    0 marks
  3. (c)

    Vegetative propagation is advantageous in some plants.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/4/1.

Hints

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

Hint 1

Which hormone is called the 'fight or flight' hormone, and where is it made?

Hint 2

Think of the social misuse of knowing the sex of the unborn child, and of what bananas and roses cannot do.

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. (a) In stress or danger, the adrenal gland secretes adrenaline into the blood. Adrenaline increases the heart rate and breathing rate and sends more blood to the muscles. This prepares the body to face or escape the emergency, so the gland is called the stress gland.

    1 mark

  2. (b) Prenatal sex determination is banned to stop female foeticide, the killing of female foetuses. This practice causes a sharp decline in the female-to-male sex ratio.

    1 mark

  3. (c) Vegetative propagation is advantageous because:

    • plants raised this way flower and fruit earlier than plants grown from seeds;
    • plants that have lost the ability to produce seeds, such as banana, orange, rose and jasmine, can still be propagated;
    • the new plants are genetically similar to the parent, so desirable characters are kept.

    (Any one point earns the mark.)

    1 mark

Answer: (a) It secretes adrenaline, which prepares the body for emergencies. (b) To prevent female foeticide. (c) Earlier flowering and fruiting, propagation of seedless plants, and offspring identical to the parent.

Where the marks are

  • Links the adrenal gland to adrenaline, which prepares the body for stress (1 mark)
  • Gives prevention of female foeticide as the reason for the ban (1 mark)
  • Gives any one valid advantage of vegetative propagation (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paper2026 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.