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The digestion of food in… (Class 10 Science 2025, Q29)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 29

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, 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

The digestion of food in human alimentary canal is a complex process. State the enzyme/salt present in the following and mention their function in the process of digestion :

  1. (i)

    Saliva

    0 marks
  2. (ii)

    Bile Juice

    0 marks
  3. (iii)

    Pancreatic Juice

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

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

Hint 1

Each juice acts on a particular class of food: carbohydrate, fat or protein.

Hint 2

Bile contains no enzyme. It acts physically on fats and also changes the pH of the food.

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) Saliva: contains the enzyme salivary amylase.

    ½ mark

  2. (i) Function: salivary amylase breaks down starch into simple sugar.

    ½ mark

  3. (ii) Bile juice: contains bile salts.

    ½ mark

  4. (ii) Function: bile salts emulsify fats into small globules, and bile makes the acidic food from the stomach alkaline so that pancreatic enzymes can act.

    ½ mark

  5. (iii) Pancreatic juice: contains the enzymes trypsin and lipase.

    ½ mark

  6. (iii) Function: trypsin digests proteins, and lipase breaks down emulsified fats.

    ½ mark

Answer: (i) Salivary amylase: starch to sugar; (ii) Bile salts: emulsify fats and make food alkaline; (iii) Trypsin: digests proteins / Lipase: breaks down emulsified fats.

Where the marks are

  • Salivary amylase named with its function, starch to sugar (½ + ½ mark)
  • Bile salts named with their function, emulsification or making food alkaline (½ + ½ mark)
  • Trypsin or lipase named with its function (½ + ½ 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 paper2025 board paper, set 31/4/1: 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.