Refer to the figure below showing the changes that occur when a leaf is about to fall from the stem. A decrease in auxin in which region of the diagram would result in formation of the abscission zone?
A) Stem
B) Leaf blade
C) Apical meristem
D) Petiole
E) Stomata

Question

Refer to the figure below showing the changes that occur when a leaf is about to fall from the stem.  A decrease in auxin in which region of the diagram would result in formation of the abscission zone?
A) Stem 
B) Leaf blade 
C) Apical meristem 
D) Petiole 
E) Stomata

Quizplus · Accepted Answer

The abscission zone is the region where the leaf detaches from the stem. This region is located at the base of the petiole. A decrease in auxin in the petiole region would result in the formation of the abscission zone. Therefore, the best choice is D, petiole.

Refer to the Figure Below Showing the Changes That Occur