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Answer the following. (Class 10 Science 2024, Q29b)

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ScienceCBSE Class 10 · Board exam 2024, set 31/2/1 · 3 marks · Short answer

CBSE Class 10 Science 2024: question 29(b)

Set in the CBSE Class 10 board exam of 2024, paper 31/2/1, section C, question 29(b), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q29(b) · 3 marks · Short answerLife Processes

Answer the following.

  1. (i)

    Name the movements that occur all along the gut in human digestive system. How do they help in digestion ?

    0 marks
  2. (ii)

    Where is bile juice stored in human body ? List two roles of bile juice.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/2/1.

Hints

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

Hint 1

The wave-like muscle contractions of the gut have a special name.

Hint 2

Bile is made in the liver but kept in a small sac; think about fats and stomach acid.

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) The movements are called peristaltic movements (peristalsis).

    ½ mark

  2. The muscles of the gut wall contract and relax rhythmically. This pushes the food forward in a regulated way so that each part of the gut gets enough time to digest and absorb it properly.

    1 mark

  3. (ii) Bile juice is made in the liver and stored in the gall bladder.

    ½ mark

  4. Role 1: It makes the acidic food coming from the stomach alkaline, so that pancreatic enzymes can act.

    ½ mark

  5. Role 2: Bile salts emulsify fats, breaking large fat globules into smaller ones and increasing the surface area for lipase to act.

    ½ mark

Answer: (i) Peristalsis, which pushes food along at a regulated pace for proper digestion; (ii) gall bladder; bile makes the medium alkaline and emulsifies fats.

Where the marks are

  • Names peristaltic movements (½ mark)
  • Explains rhythmic contraction moving food forward in a regulated way (1 mark)
  • Gall bladder (½ mark)
  • Two roles: emulsification of fats and making the medium alkaline (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 paper2024 board paper, set 31/2/1: 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.