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Question
Leaf fall occurs when the amount of
Leaf fall occurs when the amount of
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Solution
The correct option is D Auxin decreases
Auxins are growth promoting phytohormones. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering, e.g., in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits. Abscisic acid acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis, promotes senescence and increases the tolerance of plants to various kinds of stresses.Thus, the correct answer is option B.
Auxins are growth promoting phytohormones. They help to initiate rooting in stem cuttings, an application widely used for plant propagation. Auxins promote flowering, e.g., in pineapples. They help to prevent fruit and leaf drop at early stages but promote the abscission of older mature leaves and fruits. Abscisic acid acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis, promotes senescence and increases the tolerance of plants to various kinds of stresses.
Thus, the correct answer is option B.
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