Grapes Growing on a Vine Are Observed to Shrink During

question 28

Multiple Choice

Grapes growing on a vine are observed to shrink during the day, only gaining in size at night. You decide to do an experiment where you freeze the stem supplying a cluster of grapes with a copper clamp cooled to just a few degrees below zero and then thaw it. The rationale for this treatment is that freezing the large-diameter xylem vessels of a vine leads to the formation of air bubbles, but has no long-term effect on phloem transport. In the days following this treatment, you expect to see that, for the grapes in the experimental cluster:

• A)grape size continues to shrink during the day and increase at night.
• B)grape size increases during both the day and the night.
• C)the grapes dry out and shrivel due to freeze-thaw cavitation.
• D)grape size remains constant.

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Definitions:

Disorganized Speech

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