Where does gas exchange occur in a plant?

Gas exchange in a plant occurs through the tiny pores called stomata found in the leaves of plants.

Gas exchange occurs during photosynthesis. Carbon dioxide is taken from the atmosphere through the stomata and oxygen is released as a waste product.  Gas exchange is essential for the  plant's survival.

Normally stomata open when the light strikes the leaf in the morning and close during the night. Opening and closing of stomata is guided by two guard cells which are found on each side of the stomata.  When the guard cells become turgid,  they bend into a crescent shape allowing the stomata to open. When they lose turgor pressure, they become flaccid and return to their original shape and the stomata close.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.