The event that triggers fruit formation is the growth of a pollen tube through the carpel of a flower. Identify a reasonable hypothesis about the basis of this effect
A) Pollen tubes grow in response to a cytokinin produced by the carpel.
B) Pollen tubes grow in response to abscisic acid.
C) The growing pollen tube produces ethylene.
D) The growing pollen tube produces auxins and/or gibberellins.
Answer: D
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