Question

stomata is the site of entry of co2 for photosynthesis but stomata are not open always why

Answer 1

How Do Stomata Work in Photosynthesis

Stomata are anatomical features that are located on the underside of the leaves of plants that live on land. These structures, which are the 'pores' of the plant's skin, provide openings for the exchange of oxygen and carbon dioxide. Water is also released through the stomata in a process called transpiration. Stomata are opened and closed with cells called guard cells. These cells swell by the process of osmosis when there is an excess of water in the plant. This swelling causes the stomata to open, allowing water to evaporate. When the amount of water within the plant begins to lower below the point necessary for photosynthesis, the guard cells shrink and the stomata close to conserve water.

Answer 2

when the leaves doesnt want co2 for photosynthesis....they close their stomata