Grapes Growing on a Vine Are Observed to Shrink During

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.