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In a human female, menstrual… (Class 12 Biology 2026, Q5)

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

CBSE Class 12 Biology 2026: question 5

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

Q5 · 1 mark · MCQHuman Reproduction

In a human female, menstrual cycle of 28 days is represented by the diagram given below.

Select the correct statement related with this diagram.

  1. (A)Primary follicle of ovary matures into Graafian follicle in phase II.
  2. (B)The hormone secreted in large amounts in phase III is also responsible for maintaining pregnancy in human females.
  3. (C)Corpus luteum secretes progesterone in phase I, however it degenerates completely in phase III.
  4. (D)Both (A) and (B).

Figure in the paper: Circular chart of a 28-day cycle divided into days 1-28, 'Cycle starts here' at top. Phase I covers days 1 to about 6/7, phase II covers days about 7 to 14, and phase III covers days 15 to 28. See it in the official paper.

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

Name the phases of the cycle: menstrual, follicular and luteal.

Hint 2

Which hormone dominates the luteal phase, and what does it do during pregnancy?

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. Phase II (days 6–14) is the follicular phase, in which the primary follicle matures into a Graafian follicle. Statement (A) is correct.

    ½ mark

  2. Phase III is the luteal phase. The corpus luteum secretes large amounts of progesterone, which also maintains pregnancy, so statement (B) is correct. Statement (C) is wrong because there is no corpus luteum in phase I. The answer is (D).

    ½ mark

Answer: (D) Both (A) and (B)

Where the marks are

  • Identifies statements A and B as correct and chooses (D) (1 mark)

Revise the chapter

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.