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Answer the following. (Science 2025 31/1/1 Q35a)

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ScienceCBSE Class 10 · Board exam 2025, set 31/1/1 · 5 marks · Long answer

CBSE Class 10 Science 2025: question 35(a)

Set in the CBSE Class 10 board exam of 2025, 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?

Answer the following.

  1. (i)

    Write the functions of the following parts of human female reproductive system: (I) Ovary (II) Fallopian tube (III) Uterus

    0 marks
  2. (ii)

    State briefly two contraceptive methods used by human males.

    0 marks

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

Hints

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

Hint 1

Follow the path of the egg: where it is made, where it meets the sperm, and where the baby grows.

Hint 2

Male methods either physically stop sperm from entering the female or stop sperm from leaving the testes.

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)(I) Ovary: produces the female gametes (eggs/ova). One egg is released each month.

    ½ mark

  2. The ovary also secretes the female hormones oestrogen and progesterone.

    ½ mark

  3. (i)(II) Fallopian tube (oviduct): carries the egg from the ovary towards the uterus. It is the site where the sperm meets the egg, so fertilisation takes place here.

    1 mark

  4. (i)(III) Uterus: the zygote/embryo gets implanted in its thick, blood-rich lining. The embryo grows and develops there, getting nourishment through the placenta.

    1 mark

  5. (ii) Method 1 – Mechanical barrier (condom): a sheath worn over the penis during intercourse. It stops sperm from reaching the egg and also protects against sexually transmitted infections.

    1 mark

  6. (ii) Method 2 – Surgical method (vasectomy): the vas deferens is cut or blocked surgically, so sperms cannot be transferred.

    1 mark

Answer: (i) Ovary – produces eggs and female hormones (oestrogen); Fallopian tube – carries egg, site of fertilisation; Uterus – site of implantation and development of embryo. (ii) Condom (mechanical barrier) and vasectomy (blocking vas deferens).

Where the marks are

  • Ovary produces eggs (½ mark) and secretes oestrogen (½ mark)
  • Fallopian tube is the site of fertilisation (1 mark)
  • Uterus is the site of implantation and development of the embryo (1 mark)
  • Condom as a barrier method (1 mark)
  • Vasectomy – blocking of vas deferens (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 paper2025 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.