How does the auxin produced at the tip of the stem, helps in bending towards the light?

Asked by  | 24th Aug, 2010, 12:45: PM

Expert Answer:

Light causes the hormone auxin to move to the shaded side of the shoot.

The auxin causes the cells on the shaded side to elongate more than the cells on the illuminated side. As a result, the shoot bends towards the light and exhibits positive phototropism. In some plant stems, phototropism is not caused by auxin presence or movement. In these instances, light causes the production of a growth inhibitor on the illuminated side of the shoot.

Answered by  | 24th Aug, 2010, 07:57: PM

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