Question

Explain properly about the phototropic movements?

Answer 1

Tropism:

1. The growth or response of plants or lower animals towards or away from a stimulus is known as tropism.
2. There are six types of tropism thigmotropism, phototropism, geotropism, thermotropism, chemotropism and hydrotropism.

Phototropic movement:

1. Phototropic movement is the movement of plant or plant parts in response to light.
2. The phototropic movement is due to the presence of a plant hormone called auxin.
3. There are two types of phototropic movement positive phototropism and negative phototropism.
4. If the plant parts move towards the light it is called positive phototropic movement. For example, stems are positively phototropic.
5. If the plant parts move away from the light it is called a negative phototropic movement. For example, roots are negatively phototropic.