When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petaks of a dandelion flower close.
(a) State one way in which the above two processes are similar.
(b) State two ways in which the above two processes differ.

Answer

(a) Both are nasties (or nastic movements) (b) In the folding of leaves of sensitive plant, stimulus is touch but in the folding of petals of dandelion flower, stimulus is light ; Folding of leaves of a sensitive plant is not a growth movement but the closing of petals of a dandelion flower is a growth movement