The Pair of Cells That Surround Each Stoma and Control

question 29

Multiple Choice

The pair of cells that surround each stoma and control its opening and closing are

• A) pith cells.
• B) sieve tube cells.
• C) guard cells.
• D) vascular cells.
• E) companion cells.

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Definitions:

Gas Chromatography

An analytical technique used to separate, identify, and quantify compounds in a mixture by passing them through a column filled with a stationary phase while being propelled by a gas.

Enantiomers

Stereoisomers that are mirror images of each other and cannot be superimposed, different in the way they rotate plane-polarized light.

Optically Active

Describes a substance that has the ability to rotate the plane of polarization of polarized light, a property of chiral molecules.

Distillation

A process used to separate components of a liquid mixture based on differences in their boiling points.