Question

Question 19
The movement of sunflower in accordance with the path of the sun is due to

(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism

Answer 1

(a) phototropism

Phototropism is a tropic movement in which the plants respond to external stimuli (light). If the plant growth is towards the light source, it is called positive phototropism, while if the growth is away from the light source, it is called negative phototropism.