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Pravin was given a list of… (Class 10 Science 2026, Q1)

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ScienceCBSE Class 10 · Board exam 2026, set 31/3/1 · 1 mark · MCQ

CBSE Class 10 Science 2026: question 1

Set in the CBSE Class 10 board exam of 2026, paper 31/3/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQLife Processes

Pravin was given a list of characteristics associated with the process of anaerobic respiration in humans, in the table given below :

LocationConditionEnd Product
Characteristic(i) Muscle Cell(ii) Requires presence of Oxygen () and Carbon dioxide ()(iii) 3-Carbon molecules

Which of the above characteristics is/are related to the above process ?

  1. (A)(i) and (ii)
  2. (B)(i) and (iii)
  3. (C)(ii) and (iii)
  4. (D)(i) only

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 31/3/1.

Hints

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

Hint 1

Ask whether anaerobic respiration needs oxygen at all.

Hint 2

Lactic acid is formed in muscles; count its carbon atoms.

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. In humans, anaerobic respiration happens in muscle cells during vigorous exercise when oxygen runs short, so (i) is correct. It does not need oxygen, so (ii) is wrong.

  2. Glucose (6C) is broken into pyruvate (3C), which is then converted to lactic acid, also a 3-carbon molecule, so (iii) is correct. Option (B).

    1 mark

Answer: (B) (i) and (iii)

Where the marks are

  • Selects (i) and (iii), option (B) (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 paper2026 board paper, set 31/3/1: 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.