What is the role of auxin in plant tropism?

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It promotes growth towards the gravity direction

It promotes growth away from the light source

It promotes growth away from the gravity direction

It promotes growth towards the light source

answer is A.

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Detailed Solution

Auxin is the phytohormone which is usually synthesised in the young tip of roots and shoots.

When the light falls on one side of the plant, auxin diffuses towards the shady side
of the shoot which stimulates the cells to grow longer, resulting in the bending of the shoot towards the light, thus auxin promotes phototropism.

Hence, auxins promote growth towards the light source.

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