Question

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Answer 1

Answer:

Cytokinins are plant hormones that cause increased cell division by stimulating the process of mitosis. They are made naturally by plants but have been synthesized by humans. Increased mitosis results in plant growth and the formation of shoots and buds, as well as the development of fruits and seeds.

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Answer 2

Answer:

(i) Function of cytokinins : The important physiological effects of these cytokinins on plant growth are as follows:

(A) Cell division: One of the main functions of cytokinins is in cell division and more particular cytokinesis.

(B) Secondary growth: Cytokinins overcome apical dominance and promote the growth of lateral bunds.

(D) Senescence: Cytokinins can inhibit or delay senescence (ageing). Leaves treated with cytokinins, retain

chlorophyll for longer period i.e., they remain green for a longer period.

(E) Morphogenesis

(F) Induction of flowering

(G) Callus growth.

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