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(i) Name three techniques/dev… (Class 10 Science 2024, Q35A)

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ScienceCBSE Class 10 · Board exam 2024, set 31/1/1 · 5 marks · Long answer

CBSE Class 10 Science 2024: question 35(A)

Set in the CBSE Class 10 board exam of 2024, paper 31/1/1, section D, question 35(A), for 5 marks. Try it first; the hints and our step-by-step solution are below.

Q35(A) · 5 marks · Long answerHow do Organisms Reproduce?

(i) Name three techniques/devices used by human females to avoid pregnancy. Mention the side effects caused by each.
(ii) What will happen if in a human female (a) fertilisation takes place, (b) an egg is not fertilised ?

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

Hints

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

Hint 1

Think of three types of method: one hormonal, one device placed in the uterus, one operation.

Hint 2

The uterus prepares a lining every month. What happens to it with and without a zygote?

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. (i) Technique 1: Chemical method, i.e. oral contraceptive pills.

    ½ mark

  2. Side effect: they change the hormonal balance of the body.

    ½ mark

  3. Technique 2: Intrauterine device such as the Copper-T or loop.

    ½ mark

  4. Side effect: it can cause irritation of the uterus.

    ½ mark

  5. Technique 3: Surgical method, in which the fallopian tubes are blocked (tubectomy).

    ½ mark

  6. Side effect: if not done properly, it may cause infections and other problems.

    ½ mark

  7. (ii)(a) If fertilisation takes place, the zygote starts dividing and gets implanted in the thick, spongy lining of the uterus. It develops into an embryo and pregnancy begins.

    1 mark

  8. (b) If the egg is not fertilised, the thickened uterine lining is not needed. It breaks down and comes out through the vagina as blood and mucus; this is menstruation.

    1 mark

Answer: (i) Oral pills (hormonal imbalance), Copper-T (uterine irritation), surgical blocking of fallopian tubes (infection); (ii)(a) zygote implants in uterus; (b) lining sheds as menstruation

Where the marks are

  • Three methods named (½ mark each)
  • Side effect of each (½ mark each)
  • Fertilisation: zygote implants in uterine lining (1 mark)
  • No fertilisation: lining breaks down, menstruation (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from How do Organisms Reproduce?, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 31/1/1: 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.