Question

Give appropriate biological/ technical terms for the following-

Directional growth movement of curvature that occurs in response to touch.

Answer 1

Growth movements in plants

1. Plants show growth movements in response to external stimuli like light, gravity, water, chemicals, etc. This can either be towards the stimulus or away from the stimulus.
2. A directional growth movement in response to touch or friction is called thigmotropism.
3. Thigmotropism is seen in plants like tendrils of grapevines which have a weak stem. These stems are unable to stay upright and require an object to grow.