Guard Cells Are the Only Cells in the Epidermis That

question 59

Multiple Choice

Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because

• A)chloroplasts sense when light is available so that guard cells will open.
• B)photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells.
• C)guard cells will produce the O2 necessary to power active transport.
• D)ATP is required to power proton pumps in the guard cell membranes.
• E)A and C

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Definitions:

Figure-ground

A visual perception principle that describes how people differentiate an object (figure) from its surrounding area (ground).

Closure

A psychological term referring to the need for an individual to seek a resolution or an understanding to a traumatic or unsettling event or experience.

Brightness Constancy

The human visual system's ability to perceive the brightness of an object as the same under varying lighting conditions.

Ratio

A mathematical term defining the quantitative relationship between two numbers, showing how many times one value contains or is contained by the other.