HORTICULTURE

Detailed explanation-1: -Positive phototropism is growth towards a light source; negative phototropism is growth away from light.

Detailed explanation-2: -Phototropism is the movement of plant parts in response to light. Thus, the stimulus for phototropism is “Light”.

Detailed explanation-3: -Phototropism is a response to the stimulus of light. In the plant stem, responses to light are known as a positive phototropism, which means the stem grows towards the light. In the plant root, responses to light are known as a negative phototropism, which means the root grows away from the light.