NEET BIOLOGY

Detailed explanation-1: -Stomata are pores found on stems, leaves and other plant parts that control gas exchange.

Detailed explanation-2: -Typically, stomata are open during the day and closed at night, like some people’s mouths. Many other signals cause stomata to open and close. Open stomata allow carbon dioxide to enter the plant, however, water vapour can escape, so regulation of stomata is crucial for maintaining plant water status.

Detailed explanation-3: -The stomata are most common on green aerial parts of plants, particularly the leaves. They can also occur on stems, but less commonly than on leaves. The aerial parts of some chlorophyll-free land plants (Monotropa, Neottia) and roots have no stomata as a rule, but rhizomes have such structures (Esau, 1965, p. 158).

Detailed explanation-4: -Stomata resemble doughnuts-a circular pore with a hole in the middle for gas to enter or leave the plant. The pore consists of two cells-each known as a guard cell.

Detailed explanation-5: -Most angiosperm trees have stomata only on their lower leaf surface.