Native auxin (endogenous) is transported in the plant

From the shoot tip in the downward direction

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From the root tip in the upward direction

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Through vascular systems in plants

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By a special transport system in the root

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Solution

The correct option is A From the shoot tip in the downward direction
The term auxin is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth regulating properties. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action. As most important site of auxin synthesis is shoot tips, they frequently migrate in the downward direction.
Thus, the correct answer is option A.

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