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Question

In the process of apical dominance, lateral buds are unable to grow in the presence of apical bud. This is due to

A
Less amount of cytokinins in lateral buds
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B
More amount of cytokinins in lateral buds
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C
Less amount of auxin in lateral buds
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D
More amount of auxin in lateral buds.
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Solution

The correct option is D More amount of auxin in lateral buds.
The end of a shoot contains an apical bud, from where the shoot growth occurs. The lateral buds are more sensitive to auxin than the apical bud. There is a concentration of auxin at which the growth of apical bud is stimulated, they are unable to grow above that concentration. In the process of apical dominance, lateral buds are unable to grow in the presence of apical bud. The apical bud produces auxin (IAA) that inhibits the growth of the lateral buds further down on the stem towards the axillary bud and promotes the growth of apical buds.

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