Which plant hormone induces apical hook formation in dicot seedlings?
Ethylene induces apical hook formation in dicot seedlings to protect the shoot tip during germination. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.