Supra optima (more than 10 ppm) concentration of auxin

Promotes flowering

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Kill the plant

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Prevent shortening of the internodes

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Promotes growth in both, stem and roots apex

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Solution

The correct option is B Kill the plant
Auxin are growth promoting phytohormones. They promote growth in extremely minute quantities. At higher concentration, they are harmful and may kill the plant. The exact mechanism by which this effect is caused is not known, but it is believed that higher concentration of auxins increases growth promotion to such an extent that plant is killed, i.e., plant grows to meet its end.
Thus, the correct answer is option B.

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