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During which of the… (Class 10 Science SQP 2024-25, Q9)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2024-25: question 9

From the official CBSE sample question paper for 2024-25, section A, question 9, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q9 · 1 mark · MCQLife Processes

During which of the following stages of the circulation of blood in a normal human being, the oxygenated blood is pumped to all parts of the body?

  1. (A)contraction of the left atrium
  2. (B)contraction of left ventricle
  3. (C)relaxation of the right atrium
  4. (D)relaxation of the right ventricle

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2024-25.

Hints

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

Hint 1

Which side of the heart carries oxygenated blood?

Hint 2

Which chamber sends blood into the aorta?

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. Oxygenated blood from the lungs enters the left atrium and then passes into the left ventricle.

    ½ mark

  2. When the thick-walled left ventricle contracts, it pumps this blood into the aorta and on to all parts of the body. The answer is option (B).

    ½ mark

Answer: Contraction of left ventricle; option (B)

Where the marks are

  • Identifies left ventricle contraction as pumping oxygenated blood to the body (1 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 paperSample paper 2024-25: 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.