Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMARCH 20241 Mark
MCQ
Identify the growth hormone in plants which causes inhibitory effect.
A
Cytokinins
B
Abscissic acid
C
Gibberellin
D
Ethylene
✓
Answer
Abscissic acid Explanation : The term ‘hormone’ was coined first by Starling (1906) in animal physiology. The internal factors that influence growth are called growth hormones or growth regulators as they inhibit, promote or modify the growth. Growth promoters are auxins, gibberellins (GA) and cytokinins (CK). Growth inhibitors in plants are ethylene and abscissic acid (ABA).
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