A leaf after being plucked from a plant can still remain green if it is dipped in:

Auxin

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Gibberellin

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Cytokinin

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Abscisic acid

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Solution

The correct option is C Cytokinin
A leaf after being plucked from a plant can remain green if it is dipped in cytokinin. This is because cytokinin promotes nutrient mobilisation and delays senescence (ageing) so chlorophyll will be retained and leaves will remain green for a longer time.

Auxin is a plant growth promoter that helps to promote apical dominance (a phenomenon in which the growth of the main central stem of the plant is more as compared to the other stems), helps in initiation of flowering (e.g in pineapple), and can also be used as a weedicide (e.g 2,4-D).

Gibberellin is a plant growth promoter that helps in the germination of seeds and elongation of shoots, stimulation of flowering.

Abscisic acid is a plant growth inhibitor that plays an important role in seed development, maturation and seed dormancy. Seed dormancy is the condition of seeds that are incapable of germinating even when the conditions suitable for seedling growth are supplied.

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Question 29
Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented.

Under what conditions do these grapes ferment? Is it a chemical or a physical change?

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