Q. Consider the following statements:

1. The opening and closing of the pore in leaves is a function of the stomata.
2. Desert plants take up oxygen at night and prepare an intermediate which is acted upon by the energy absorbed by the chlorophyll during the day.
3. Stomata help in the exchange of gases across the surface of stems, roots, and leaves as well.

Which of the above statements is/are correct?
Answer: Only 3
Notes: Statement 1 is incorrect because the opening and closing of stomata are controlled by guard cells, not by stomata itself. Statement 2 is incorrect as desert plants (CAM plants) take up carbon dioxide, not oxygen, at night and convert it into an intermediate compound. Statement 3 is correct; stomata facilitate gas exchange across stems, roots, and leaves.