Question

___ is the growth of an organism which responds to a light stimulus.

Answer 1

Phototropism is the growth of an organism which responds to a light stimulus. It refers to the movement of a plant toward a light source.
There are two types of phototropism.
a) Positive phototropism: The orientation of a plant or other organism in response to light, towards the source of light.
b) Negative phototropism: The orientation of a plant or other organism in response to light, away from the source of light.