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The foetal ejection reflex in… (Class 12 Biology 2026, Q2)

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BiologyCBSE Class 12 · Board exam 2026, set 57/5/1 · 1 mark · MCQ

CBSE Class 12 Biology 2026: question 2

Set in the CBSE Class 12 board exam of 2026, paper 57/5/1, section A, question 2, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q2 · 1 mark · MCQHuman Reproduction

The foetal ejection reflex in human triggers the release of _________ hormone from __________.

Fill in the blanks by choosing right option.

  1. (A)oxytocin, foetal pituitary
  2. (B)oxytocin, maternal pituitary
  3. (C)human chorionic gonadotropin, placenta
  4. (D)progesterone, corpus luteum

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/5/1.

Hints

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

Hint 1

Which hormone causes the strong uterine contractions of labour?

Hint 2

Ask whose gland releases it: the mother's or the baby's?

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. Signals from the fully developed foetus and the placenta cause mild uterine contractions; this is the foetal ejection reflex.

    ½ mark

  2. The reflex makes the maternal pituitary release oxytocin, which causes strong uterine contractions for parturition. The answer is option (B).

    ½ mark

Answer: (B) oxytocin, maternal pituitary

Where the marks are

  • Chooses option (B) (1 mark)

Revise the chapter

  • Chapter: Human Reproduction (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Human Reproduction, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 57/5/1: 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.