Which plant hormone promotes seed dormancy, bud dormancy and causes stomatal closure
a) IAA b) Abscisic acid c) GA d) cytokinin
AA
BB
CC
DD
A.
(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.