Question

i) What happens to the dandelion flower
a) during the daytime?
b) at night?
ii) What is the phenomenon known as?

Answer 1

Answer:

(i)(a)  During the day time, the dandelion flower opens up.

(b) During the night, the dandelion flower closes.

(ii) This phenomenon is called photonasty.

Nastic movements are the movements of plants as a response to environmental stimuli. These movements are non-directional which means these movements do not depend on the direction of the stimuli.

Photonasty is the movement of the plant in response to light. For example, during the day time when the dandelion flower gets sunlight, the petals of the flower open up whereas during the night when the flower does not get sunlight, the petals fold and the flower closes.