Assertion. Stomata remain open during the day time.
Reason. Stomata help in exchange of gases.

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Solution

Stomata remains open during the day time due to availablity of sunlight. When sunlight is available photosynthesis takes place and the gaseous exchange is required at a higher rate.
So more gaseous exchange due to high rate of Photosynthesis leads to opening of stomata in the day.
Assertion and reason both are correct and the reason is the correct explaination for the assertion.

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Similar questions

Given below are assertion and reason. Point out if both are true with reason being correct explanation(A), both true but reason is not correct explanation (B), assertion is true but reason is wrong (C) ad both are wrong (D).

Assertion: Stomata remain open during day time.

Reason: Stomata help in exchange of gases

Q. Stomata and________ help in the exchange of gases in plants.

Q. Assertion :Normally stomata are open in the day time and close during the night. Reason: The cause of the opening or closing of stomata is the change in the turgidity of the guard cells.

stomata open during night and remain closed during the day time

Q. In which type of plants, the stomata remain closed during day time and open during night?

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Assertion. Stomata remain open during the day time. Reason. Stomata help in exchange of gases.

Assertion. Stomata remain open during the day time.
Reason. Stomata help in exchange of gases.