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ICSE Class 10 Biology Question 19 of 30

Solved Sample Paper 2 — Question 15

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Question 5(v)

The diagram given below is a representation of K+ transport mechanism of stomatal opening and closing. Study the same and answer the questions that follows:

The diagram is a representation of K+ transport mechanism of stomatal opening and closing. Name the cell labelled as A. Mention the states of guard cells represented by B and C. What causes closure of stomata during night? Biology Sample Paper Solved ICSE Class 10.

(a) Name the cell labelled as A.

(b) Mention the states of guard cells represented by B and C.

(c) What causes closure of stomata during night?

Answer

(a) A represents epidermal cells.

(b) The state of guard cell represented by B is turgid and the state of guard cell represented by C is flaccid.

(c) During day, the guard cells have high concentration of K+ making it hypertonic. During night, the K+ ions are transported to epidermal cells due to which there is loss of water from guard cells making them flaccid. The stomata closes when guard cells are flaccid.