Question

Petioles of leaves are weakened leading to falling of leaves due to

• A. Excess production of ethylene
• B. Excess production of cytokinin
• C. Excess production of auxin
• D. Excess production of gibberellin

Answer 1

The correct option is A

Excess production of ethylene

Ethylene is a gaseous hormone which helps in the ripening of fruits. An excess amount of ethylene causes the dropping of leaves and fruits. Auxins, when in excess, prevents the growth of roots and the formation of fruits. Auxin and cytokinin promote cell elongation.