Question

Why does the root of a plant show negative phototropism?
Please give appropriate explanation as soon as possible

Answer 1

The movement of the root of a plant is towards water. As water is present underground the root grows in the downward direction.

Phototropism is the movement of shoot towards light. The shoot grows towards the sunlight in the upward direction.

The root shows negative phototropism because the movement of root is in the direction opposite to that of light.

Answer 2

Root is negatively phototropic as it always bends away from the light.
Auxin is responsible for bending.More auxin moves towards darker side. So the cells of darker side divide faster than the cells on illuminated side, and the shoots bends towards the direction of light.
In roots, lesser concentration of auxin stimulates growth and higher concentration inhibits growth. As a result, root moves away from light.
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