The event that triggers fruit formation is the growth of a pollen tube through the carpel of a flower. Which of the following is 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.

Question

Quizplus · Accepted Answer

Auxins and/or gibberellins are plant hormones that are responsible for cell elongation and growth. The growth and elongation of the pollen tube is likely due to the production of these hormones by the pollen itself, as it grows through the carpel to reach the ovules.

The Event That Triggers Fruit Formation Is the Growth of a Pollen