Question

Plant parts show two types of movements, one dependent on growth and the other independent of growth. Give one example of the movement in plant parts:

(a) which depends on growth

(b) which does not depend on growth

Answer 1

(a) Phototropism depends on growth. It is the growth of plant stem in response to sunlight.
(b) Thigmonasty does not depend on growth. It is a non-directional movement of the plant part, such as leaves, in response to touch.