STD 11 - 13. Plant growth and development — BIOLOGY STD 11 Science — Question
Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 13. Plant growth and development1 Mark
MCQ
Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure?
A
$IAA$
✓
Abscisic acid
C
$GA$
D
Cytokinin
✓
Answer
Correct option: B.
Abscisic acid
b Abscisic acid is a natural growth inhibitor. It promotes stomatal closure, i.e., it is a stress hormone and helps the plant to cope with adverse enviromental conditions especially drought. It also induces dormancy of seeds and buds. These seeds sprout only when $ABA$ is overcome y $GA.$
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