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Name the blood vessel that… (Class 10 Science 2025, Q29)

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ScienceCBSE Class 10 · Board exam 2025, set 31/6/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 29

Set in the CBSE Class 10 board exam of 2025, paper 31/6/1, section C, question 29, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q29 · 3 marks · Short answerLife Processes

Name the blood vessel that brings (i) oxygenated blood (ii) deoxygenated blood, to the human heart. Also name that chamber of the heart which receives deoxygenated blood and state how deoxygenated blood from this chamber is sent to lungs for oxygenation.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/6/1.

Hints

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

Hint 1

Veins bring blood to the heart. Which vein comes from the lungs and which from the body?

Hint 2

Trace the right side of the heart: upper chamber → lower chamber → artery to the lungs.

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. (i) Oxygenated blood is brought to the heart (left atrium) from the lungs by the pulmonary vein.

    ½ mark

  2. (ii) Deoxygenated blood is brought to the heart from the body by the vena cava.

    ½ mark

  3. The chamber that receives deoxygenated blood is the right atrium.

    ½ mark

  4. After the right atrium fills with blood, it contracts.

    ½ mark

  5. This pushes the blood into the right ventricle, which expands to receive it.

    ½ mark

  6. The right ventricle then contracts and pumps the deoxygenated blood to the lungs through the pulmonary artery for oxygenation.

    ½ mark

Answer: (i) Pulmonary vein; (ii) vena cava; right atrium → contracts → right ventricle → contracts → pulmonary artery → lungs

Where the marks are

  • Pulmonary vein (½ mark)
  • Vena cava (½ mark)
  • Right atrium (½ mark)
  • Right atrium contracts, blood passes to the right ventricle, which contracts and sends blood to the lungs via the pulmonary artery (½ × 3 = 1½ marks)

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 paper2025 board paper, set 31/6/1: 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.