The movement of sunflower in accordance with the path of sun is due to
(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism
Answer: A
Solution: Tropism is growth towards an external stimulus. It is of different types. In phototropism, the growth of plant is towards the direction of light. Thus, the movement of sunflower in accordance with the path of sun is due to phototropism.