Question

In autumn, many trees shed their leaves and change their color. Which explains the reason for this behavior?

A-In autumn, the amount of ethylene decreases, rendering the cells of the abscission layer more sensitive to auxin.
B-In autumn, the amount of auxin decreases, rendering the cells of the abscission layer more sensitive to ethylene.
C-In autumn, the amount of gibberellins decreases, rendering the cells of the abscission layer more sensitive to auxin.

Answer 1

B. In autumn, the amount of auxin decreases, rendering the cells of the abscission layer more sensitive to ethylene.

Answer 2

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