Question

describe the physiological mechanisms that occur to produce the downward growth of the roots?

Answer 1

downward growth of roots: +ve response to geotropism

Answer 2

Explanation:

• Geotropism which is the cause of the stem to grow straight just against the gravitational force and the roots go down towards the gravitational force.
• Geotropism can be defined as “Geo” means the earth and “tropism” means the movement of the plant triggered by the external stimulus.

• Here the stimulus is gravitational force.
• The stem goes against the gravity so it is called negative geotropism and the roots go towards the gravity so it is called positive geotropism.