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What changes are… (Class 10 Science SQP 2026-27, Q12)

questionbuddy.in/q/cbse-10-science-2026-27-sqp-q12-changes-observed-uterus-subsequent-implantation

ScienceCBSE Class 10 · Sample paper, session 2026-27 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2026-27: question 12

From the official CBSE sample question paper for 2026-27, section A, question 12, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q12 · 2 marks · Very short answerHow do Organisms Reproduce?

What changes are observed in the uterus subsequent to implantation of the young embryo in a human female?

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2026-27.

Hints

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

Hint 1

The embryo needs nutrition, so how does the uterine wall prepare to supply it?

Hint 2

Name the disc-like tissue that links mother and embryo.

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. After implantation, the lining of the uterus thickens and gets a rich supply of blood vessels to nourish the growing embryo.

    1 mark

  2. A special tissue, the placenta, forms a connection between the uterine wall and the embryo. It allows glucose and oxygen to pass to the embryo and wastes to be removed.

    1 mark

Answer: The uterine lining thickens and becomes richly supplied with blood; a placental connection develops between the uterus and the embryo.

Where the marks are

  • Thickening and rich blood supply of the uterine lining (1 mark)
  • Development of the placenta between uterus and embryo (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 paperSample paper 2026-27: 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.