Concept

ABA-induced stomatal closure is the primary drought response mechanism in plants. Understanding the complete pathway from signal perception to stomatal closure is essential for NEET.

Process Diagram

NEET-Level Summary

For NEET, the key facts are:

1. ABA = stress hormone
2. ABA → $K^{+}$ efflux from guard cells
3. $K^{+}$ efflux → decreased turgor → stomata close
4. This protects the plant from drought by reducing water loss