Question

Explain with examples three types of nastic movements

Answer 1

1. Tropisms are directional movements or growth response of a plant to the stimulus. In nastic movements, the response of the plant is non-directional. An example of tropism is thigmotropism, which is a growth response to the touch stimulus.

2. Nyctinasty is the nastic movement of plant parts such as leaves and petals in response to darkness.

3. Thigmonasty is a form of nastic movement (of a plant or a fungus) as a response to touch or vibration.

Answer 2

Answer:nyctinasty

Haptonasty

Chemonasty

Explanation: nyctinasty is the sleep movement exhibited by some plants e.g flowers of morning glory

Haptonasty is in response to touch e.g Venus fly trap

Chemonasty production of enzymes in response to chemicals e.g insect in a Venus flytrap