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Explain the role of… (Class 10 Science SQP 2024-25, Q23B)

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ScienceCBSE Class 10 · Sample paper, session 2024-25 · 2 marks · Very short answer

CBSE Class 10 Science sample paper 2024-25: question 23(B)

From the official CBSE sample question paper for 2024-25, section B, question 23(B), for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23(B) · 2 marks · Very short answerLife Processes

Explain the role of the following enzymes in the process of digestion of food in humans:
(i) Salivary amylase
(ii) Pepsin
(iii) Trypsin
(iv) Lipase

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

Match each enzyme to the food type it acts on: carbohydrate, protein or fat.

Hint 2

Recall where each enzyme is secreted: mouth, stomach or pancreas.

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) Salivary amylase, in the mouth, breaks down starch (a complex carbohydrate) into simple sugar (maltose).

    ½ mark

  2. (ii) Pepsin, in the stomach and working in an acidic medium, begins the digestion of proteins.

    ½ mark

  3. (iii) Trypsin, from pancreatic juice acting in the small intestine, digests proteins further towards amino acids.

    ½ mark

  4. (iv) Lipase, from pancreatic and intestinal juice, breaks down emulsified fats into fatty acids and glycerol.

    ½ mark

Answer: Amylase: starch → sugar; Pepsin: proteins (stomach); Trypsin: proteins → amino acids; Lipase: emulsified fats → fatty acids + glycerol

Where the marks are

  • Salivary amylase converts starch to sugar (0.5 mark)
  • Pepsin digests proteins in the stomach (0.5 mark)
  • Trypsin digests proteins into amino acids (0.5 mark)
  • Lipase breaks emulsified fats into fatty acids and glycerol (0.5 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.