Question

(a) What does a Mimosa pudica plant do in response to touch ? What is this phenomenon known as ? 

(b) What happens to the dandelion flower 

(1) during daytime, and 

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

Answer 1

(a) In Mimosa pudica plant, the leaves fold up in response to touch. This phenomenon is known as thigmonasty. 

(b) (i) A dandelion flower opens up in the morning in bright light. This phenomenon is known is positive photonasty. 

(ii) At night, the dandelion flower closes and this phenomenon is known as negative photonasty.