AP BIOLOGY

Detailed explanation-1: -Gaseous exchange-Stomatal opening and closure help in the gaseous exchange between the plant and surrounding. It helps in transpiration and removal of excess water in the form of water vapour. Stomatal closure at night prevents water from escaping through pores.

Detailed explanation-2: -Because plants must exchange gases through their stomata, closing them prevents plants from taking up carbon dioxide (CO2). Without CO2, plants cannot make carbohydrates, and plants can only obtain this critical molecule when stomata are open.

Detailed explanation-3: -Open or close the gate – stomata action under the control of phytohormones in drought stress conditions. Two highly specialized cells, the guard cells that surround the stomatal pore, are able to integrate environmental and endogenous signals in order to control the stomatal aperture and thereby the gas exchange.

Detailed explanation-4: -The movement of gases in green plants or the gaseous exchange in plants is called diffusion and it is regulated by the stomata.

Detailed explanation-5: -Gaseous exchange occurs through diffusion via stomata. Guard cells regulate each of the stomata. Exchange of gases occurs with the closing and opening of the stoma between the inferior of leaves and the atmosphere.