Question

Which of the following is/are the function(s) of abscisic acid (ABA)?

• A. ABA prevents seed germination under unfavourable conditions.
• B. ABA helps seed to withstand dessication.
• C. ABA inhibits leaf senescence.
• D. ABA induces stomatal closure.

Answer 1

Answer: (A), (B), (D)

ABA induces stomatal closure.

The following are the important functions of abscisic acid (ABA):

1) It prevents seed germination under unfavourable conditions.
2) It helps seed to withstand dessication.
3) It induces stomatal closure reducing transpiration (hence it is called stress hormone).
4) It induces senescence of leaves.