A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures:

(a) Which figure shows the correct position taken by the parts A and B of the plant?

(b) What type of phenomenon is exhibited by the figure chosen in (a) above?

What is meant by nastic movements in plants? Give one example of nastic movements in plants.

What is the difference between photonasty and thigmonasty?

Name the plant hormones which are responsible for the following effects:

(a) falling of leaves

(b) opening of stomata

(c) bending of stem towards light

(d) closing of stomata

Name the plant organs which are:

(a) positively phototropic

(b) positively geotropic

(c) negatively geotropic

(d) positively hydrotropic