Question

(a) What does a plant root do in response to water ? What is this phenomenon known as ? 

(b) What happens to the moonflower 

(i) during daytime, and 

(ii) at night ? What is this phenomenon known as ?

Answer 1

a) The plant root grows towards water and the phenomenon is known as the hydrotropism. 

(b) (i) During the daytime the petals of moon flower close when there is bright light. 

(ii) At night, when it is dark the petals of moon flower opens up. This phenomenon is known as photonasty.