McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

What regulates the closing of the stomata?

A. turgor pressure in epidermal cells
B. thickening of the inner wall of the guard cell
C. turgor pressure in the guard cells
D. light


2. How do guard cells and stomata provide evidence of a circadian rhythm, or biological clock, in plants?

A. They tend to open in the light and close in the dark.
B. If plants are kept in the dark, the stomata continue to open and close on a 24-hour basis.
C. When stomata open, they stay open for exactly the same period of time before closing.
D. The location of guard cells depends on the type of habitat in which the plant lives.
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