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Give the name of the enzyme… (Class 10 Science 2023, Q23)

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ScienceCBSE Class 10 · Board exam 2023, set 31/6/1 · 2 marks · Very short answer

CBSE Class 10 Science 2023: question 23

Set in the CBSE Class 10 board exam of 2023, paper 31/6/1, section B, question 23, for 2 marks. Try it first; the hints and our step-by-step solution are below.

Q23 · 2 marks · Very short answerLife Processes

Give the name of the enzyme present in the fluid in our mouth cavity. State the gland which produces it. What would happen to the digestion process if this gland stops secreting this enzyme?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2023 board paper, set 31/6/1.

Hints

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

Hint 1

The fluid in the mouth is saliva. Which food component does it start to digest?

Hint 2

Think about what would happen to that food component without the enzyme.

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. The enzyme in saliva is salivary amylase (ptyalin).

    ½ mark

  2. It is produced by the salivary glands.

    ½ mark

  3. If this gland stops secreting the enzyme, starch will not be broken down into sugar (maltose) in the mouth, so the digestion of starch will not begin there.

    1 mark

Answer: Salivary amylase (ptyalin); salivary gland; starch will not be broken down into sugar in the mouth.

Where the marks are

  • Names salivary amylase/ptyalin (½ mark)
  • Names salivary gland (½ mark)
  • States that starch will not be digested into sugar (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 paper2023 board paper, set 31/6/1: 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.