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Question

Which of the following options is correct based on the statements given below?

Statement 1: Gaseous exchanges in plants usually occur on the top side of leaves.

Statement 2: Tiny pores called stomata, facilitate gas exchange.

Statement 3: Carbon dioxide is the by-product of photosynthesis.

A
Only statements 1 and 3 are correct.
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B
Only statement 2 is correct.
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C
All statements are correct.
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D
Only statements 1 is correct.
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Solution

The correct option is B Only statement 2 is correct.
Statement 2 is correct. All gaseous exchanges in plants occur through tiny pores present on leaves called stomata.
During photosynthesis, carbon dioxide and water in the presence of sunlight and chlorophyll produce glucose and release oxygen. Thus statement 3 is incorrect.
While it is true that some plants such as water lilies have stomata on the top side of their leaves, most plants, however have it on their underside. Thus, statement 1 is incorrect.

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