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 helps in the exchange of gases across the surface of stems, roots and leaves as well.

Which of the above is / are correct?
Answer: Only 3
Notes: Stomata are tiny pores present on the surface of the leaves. The exchange of gases occurs across the surface of stems, roots and leaves as well. The opening and closing of the pore is a function of the guard cells. The guard cells swell when water flows into them, causing the stomatal pore to open. Similarly the pore closes if the guard cells shrink. Desert plants take up carbon dioxide at night and prepare an intermediate which is acted upon by the energy absorbed by the chlorophyll during the day.