Question

give an example of-

1). positive thermonasty

2). negative thermonasty

3). negative chemotropism

Answer 1

Nastic movement are the movement that occur in response to the external stimuli. Thermonasty is induced by temperature.

1. Positive thermonasty: Tulip and crocus flowers open, when kept in room having high tempertaure,
2. Negative thermonasty: Tulip and crocus flowers close, when kept in room having low temperature.
3. Negative chemotropism: Roots of the plant grows away from the harmful acids or chemicals.