If carbon dioxide is needed for photosynthesis and water is plentiful, which of the following is likely to occur?
a. additional water will be gained in the plant cells and become rigid
b. the stomata will close until enough water is lost
c. water pressure is going to decrease in the guard cells
water pressure is going to decrease in the guard cells d. the stomata will open until two much water is lost

The right answer is D

The stomata are at the level of the epidermis of the leaves and aerial stems, the place of passage of the gases (carbon dioxide, oxygen, water vapor) which play a fundamental role in the physiology of the plant. These structures (which can be considered as "mini-organs") interactively regulate these exchanges. They are the terrestrial plants that constitute the true interface between the external atmosphere and the internal gas network.

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