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.
• B. Only statement 2 is correct.
• C. All statements are correct.
• D. Only statements 1 is correct.

Answer 1

The correct option is B Only statement 2 is correct.

$\bullet$ Statement 2 is correct. All gaseous exchanges in plants occur through tiny pores present on leaves called stomata.
$\bullet$ During photosynthesis, carbon dioxide and water in the presence of sunlight and chlorophyll produce glucose and release oxygen. Thus statement 3 is incorrect.
$\bullet$ 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.