A) ABA
B) ethylene
C) cytokinin
D) auxin
Correct Answer: A
Solution :
Application of minute quantity of Abscisic Acid (ABA) to leaves shall reduce transpiration to a great extent through partial closure of stomata. ABA works as growth inhibitor. Ethylene is a gaseous hormone. It is used for ripening of climecteric fruits. Climecteric fruits are, fleshy fruits which show a sudden sharp rise of respiration rate at the time of ripening. Cytokinins are essential for cytokinesis though chromosome doubling can occur in their absence. They are also involved in morphogenesis. The fundamental activities of auxins are apical dominance and cell enlargement. Apical dominance is the phenomenon by which presence of apical bud does not allows nearby lateral buds to grow.
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