Question

Which one demonstrates process associated with abscission of a leaf?

• A. In the leaf concentration of both auxin and ABA decreases
• B. In the leaf concentration of both auxin and ABA increases
• C. Reduction in ABA concentration and increase of auxin concentration in the leaf
• D. Reduction in concentration of auxin and increase of concentration of ABA in the leaf

Answer 1

The correct option is D Reduction in concentration of auxin and increase of concentration of ABA in the leaf

Auxin is a plant hormone which prevents the abscission of leaves and fruits. Young leaves and fruits produce auxin and thus remain attached to the stem. When the level of auxin declines in leaves, leaves the drop. ABA induces abscission of leaves. Hence, during abscission of a leaf, there is the reduction in auxin concentration and increase in ABA concentration in the leaf.

Thus, the correct answer is option D.