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A sportsman, after a… (Class 10 Science SQP 2023-24, Q12)

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ScienceCBSE Class 10 · Sample paper, session 2023-24 · 1 mark · MCQ

CBSE Class 10 Science sample paper 2023-24: question 12

From the official CBSE sample question paper for 2023-24, section A, question 12, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q12 · 1 mark · MCQCompetency-basedLife Processes

A sportsman, after a long break of his routine exercise, suffered muscular cramps during a heavy exercise session. This happened due to:

  1. (A)lack of carbon dioxide and formation of pyruvate.
  2. (B)presence of oxygen and formation of ethanol.
  3. (C)lack of oxygen and formation of lactic acid.
  4. (D)lack of oxygen and formation of carbon dioxide.

Source: official sample paper from cbseacademic.nic.in (PDF). See it in the full Sample paper 2023-24.

Hints

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

Hint 1

What happens to respiration in muscles when oxygen runs short?

Hint 2

Which acid forms in muscle cells during anaerobic respiration?

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. During heavy exercise, the oxygen supply to muscles falls short of demand.

  2. The muscles then respire anaerobically, and pyruvate is changed into lactic acid. Lactic acid builds up and causes cramps. So the answer is option (C).

    1 mark

Answer: Option (C)

Where the marks are

  • Links cramps to lack of oxygen and lactic acid formation (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 2023-24: 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.