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B
Gibberellins
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C
Abscisic acid
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D
Cytokinins
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Solution
The correct option is D Abscisic acid
Abscisic acid is one of the most important plant growth regulators. This class of PGR is composed of one chemical compound normally produced in the leaves of plants, originating from chloroplasts, especially when plants are under stress. In general, it acts as an inhibitory chemical compound that affects bud growth, and seed and bud dormancy.
It mediates changes within the apical meristem, causing bud dormancy and the alteration of the last set of leaves into protective bud covers.