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Write the basic steps… (Class 12 Biology 2024, Q19)

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BiologyCBSE Class 12 · Board exam 2024, set 57/1/1 · 2 marks · Very short answer

CBSE Class 12 Biology 2024: question 19

Set in the CBSE Class 12 board exam of 2024, paper 57/1/1, section B, question 19, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q19 · 2 marks · Very short answerReproductive Health

Write the basic steps followed in the Assisted Reproductive Technologies (ART) programme to help childless couples. Why is it also known as test tube baby programme ?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/1/1.

Hints

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

Hint 1

Think of IVF followed by ET (embryo transfer).

Hint 2

Where does the fusion of gametes happen in this programme: inside the body or outside?

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. Step 1: Ova are collected from the wife or a female donor, and sperms from the husband or a male donor.

    ½ mark

  2. Step 2: The ova and sperms are induced to fuse and form a zygote under simulated conditions in the laboratory (in vitro fertilisation).

    ½ mark

  3. Step 3: The zygote or early embryo is transferred into the female's body (fallopian tube by ZIFT, or uterus by IUT) for further development.

    ½ mark

  4. It is called a test tube baby programme because fertilisation and early embryo formation take place outside the body, in the laboratory (in vitro).

    ½ mark

Answer: Collect gametes, fertilise in vitro to form zygote, transfer zygote/embryo into female; called test tube baby because fertilisation occurs in the laboratory (in vitro).

Where the marks are

  • Collection of ova and sperms from couple/donors (½ mark)
  • Fertilisation in laboratory under simulated conditions (½ mark)
  • Transfer of zygote/embryo into female body (½ mark)
  • Reason: initial process is in vitro, in the laboratory (½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Reproductive Health, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/1/1: 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.