Question

Explain any three growth relevant movements in plants

Answer 1

Answer:

1-Growth relevant movement- also called trophic movement which are cause d by growth of a plant part. e.g growth of leaves in a plant. 2- growth irrelevant movement- also called nastic movements and are not influenced by growth. e.g folding of leaves of plant mimosa pudica or chui mui.

Answer 2

Explanation:

Phototropism (light)

Geotropism (gravity)

Hydrotropism (water )

Chemotropism (chemicals)

Thigmotropism (touch)

Phototropism – It is the movement of plants in response to light. The shoot system of a plant exhibits this characteristic. The shoot moves towards the light.

Geotropism – It is the movement of a plant part towards the soil. This is a characteristic of the root system. The roots always move in the direction of the earth’s gravity.

Hydrotropism– It is the movement of a plant towards the water. The stimulus here is water.

Chemotropism – It is the movement of plants in response to a chemical stimulus. A classic example of this type of movement is the growth of the pollen tube towards the ovule, during fertilization, in a flower.

Thigmotropism – It is a directional movement in plants in response to touch. For e.g. the plant tendrils climb around any support which they touch.