Question

Dandelion flowers open the petals in bright light during the day time but close the petals in dark at night. This response of Dandelion flowers is called ___________.a) geonastyb) thigmonastyc) chemonastyd) photonasty

Answer 1

d) photonasty is the correct answer

Answer 2

"Geonasty, thigmonasty, chemonasty, and photonasty are called nastic movements which are non-directional stimulus responses.

Some conditions like heat, moisture, and light are usually related to plants.

Photonasty:

It is a kind of nastic movement that occurs in plants when light intensity changes. For example, the primrose at night opens flowers in evening and ends in the daytime.

The response to light of the dandelion flower involving the petal movements is one of the examples of photonasty.

Dandelion flower's response of Dandelion flowers is called Photonasty because they respond to source of light. The option d is the correct answer."