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Briefly mention the steps in… (Class 10 Science 2026, Q12)

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ScienceCBSE Class 10 · Board exam 2026, set 31/5/1 · 2 marks · Very short answer

CBSE Class 10 Science 2026: question 12

Set in the CBSE Class 10 board exam of 2026, paper 31/5/1, 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 answerLife Processes

Briefly mention the steps in double-circulation through human heart.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/5/1.

Hints

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

Hint 1

Start with the blood coming back from the lungs — which chamber receives it?

Hint 2

Left side handles oxygenated blood, right side deoxygenated blood; trace one full loop.

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. Oxygen-rich blood from the lungs enters the left atrium through the pulmonary veins; the left atrium contracts and sends it into the left ventricle.

    ½ mark

  2. The left ventricle contracts and pumps this blood into the aorta, which carries it to all parts of the body.

    ½ mark

  3. Deoxygenated blood from the body returns through the vena cava to the right atrium, which passes it into the right ventricle.

    ½ mark

  4. The right ventricle pumps it through the pulmonary artery to the lungs for oxygenation. Thus blood passes through the heart twice in one cycle – double circulation.

    ½ mark

Answer: Lungs → left atrium → left ventricle → aorta → body → right atrium → right ventricle → lungs (blood passes twice through the heart).

Where the marks are

  • Lungs to left atrium to left ventricle (½ mark)
  • Left ventricle pumps into aorta to body (½ mark)
  • Body deoxygenated blood to right atrium (½ mark)
  • Right ventricle sends blood to lungs (½ mark)

Revise the chapter

  • Chapter: Life Processes (notes, formulas, where marks are lost and every past question)
Practise this chapterBoard-style questions from Life Processes, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 31/5/1: 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.