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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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