Which plant hormone leads to exaggerated apical hook formation?

Question

Quizplus · Accepted Answer

Ethylene is the plant hormone responsible for exaggerated apical hook formation. During seed germination, the embryonic shoot (hypocotyl) grows towards the soil surface, and apical hook formation protects the shoot from damage during emergence through the soil. The production of ethylene gas induces the formation of the apical hook, which is exaggerated when there is an excess of ethylene.

Which Plant Hormone Leads to Exaggerated Apical Hook Formation