Ques. 1AIPMT 2001
Hormone responsible for senescence is
- ABA
- auxin
- GA
- cytokinin
Answer
(1) ABA
Solution
As per NCERT, abscisic acid (ABA) is a general plant growth inhibitor; it inhibits seed germination, induces dormancy and stimulates closure of stomata.
⇒ ABA promotes senescence and abscission of leaves, whereas cytokinins delay leaf senescence.
∴ ABA is the hormone responsible for senescence.
Answer: (1)