Question

Define Phototropism and Geotropism with the help of suitable diagrams.

Hint:

Phototropism occurs due to light, while geotropism is the plant's response to gravity.

Answer 1

(i) Phototropism: It is the growth response of plants to light. Plants move toward light (positive phototropism) or away from light (negative phototropism). An example is the bending of plants towards a light source. 
(ii) Geotropism: It is the response of a plant to gravity. Roots exhibit positive geotropism as they grow downward into the soil, while stems exhibit negative geotropism as they grow upward.