When a plant opens and closes its stomata, it is maintaining

a) sugar
b) chemical transmitters
c) homeostasis
d) tropism

Option C. "Homeostasis"

Explanation:

Homeostasis is the phenomenon inside the body of a living organism by which it maintains body mechanism with respect to changing environment in order to get stability.

Stomata plays a major role in the process of homeostasis in plant by reducing the water loss that takes place through the process of transpiration. When the environment is hot, stomata opens and water vapor comes out of stomata this helps in uptake of more and more water from the roots of the plants through the stems, this process cools down the plant.

When the temperature is cold outside, the stomata closes to stop the further uptake of water from the roots, this helps in maintaining the inner temperature of plant.

This is how stomata helps in maintaining homeostasis.