Answer :

(a) (i) Plant A shows positive photonasty.

(ii) Plant B shows negative photonasty.


(b) (i) In the morning, a dandelion flower opens up its petals in bright light. This phenomenon is known is positive photonasty.


(ii) A Moonflower flower closes its petals at night. This phenomenon is known as negative photonasty.


(c) Thigmonasty is the non-directional movement of a plant part in response to the touch. The folding up of leaves of plant C when touching is an example of this process.


(d) The folding up of Mimosa pudica leaves when touching is an example of Thigmonasty process.


(e) Plant A and B exhibit the phenomenon based on growth movements.


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