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Answer the following. (Class 10 Science 2023, Q29A)

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ScienceCBSE Class 10 · Board exam 2023, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2023: question 29(A)

Set in the CBSE Class 10 board exam of 2023, paper 31/4/1, section C, question 29(A), for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q29(A) · 3 marks · Short answerLife Processes

Answer the following.

  1. (i)

    How does Paramecium obtain its food ?

    1 mark
  2. (ii)

    List the role of each of the following in our digestive system : (a) Hydrochloric acid (b) Trypsin (c) Muscular walls of stomach (d) Salivary amylase

    2 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/4/1.

Hints

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

Hint 1

Unlike Amoeba, Paramecium has a fixed shape. Which hair-like structures help it take food in?

Hint 2

Match each item with the nutrient it acts on or its physical action.

Hint 3

Amylase acts on carbohydrates. Pepsin needs an acidic medium to work.

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) Paramecium is unicellular with a definite shape. Food is taken in at a specific spot (the oral groove/cytostome), where the beating of cilia moves it in. The food is then digested in a food vacuole.

    1 mark

  2. (ii)(a) Hydrochloric acid: creates an acidic medium that activates pepsin, and kills germs that enter with food.

    ½ mark

  3. (b) Trypsin: digests proteins into smaller peptides in the small intestine.

    ½ mark

  4. (c) Muscular walls of stomach: churn and mix the food thoroughly with the digestive juices.

    ½ mark

  5. (d) Salivary amylase: converts starch into sugar (maltose) in the mouth.

    ½ mark

Answer: (i) Food enters at a specific spot by ciliary movement; (ii) HCl: acidic medium / kills germs; trypsin: digests proteins; stomach muscles: churn food with juices; salivary amylase: starch to sugar

Where the marks are

  • Food taken in at a specific spot by movement of cilia (1 mark)
  • Role of HCl (½ mark)
  • Trypsin digests proteins (½ mark)
  • Muscular walls mix food with juices (½ mark)
  • Salivary amylase converts starch to sugar (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 paper2023 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.