DENDROLOGY

Detailed explanation-1: -Phototropism is a directional response that allows plants to grow towards, or in some cases away from, a source of light. Photoperiodism is the regulation of physiology or development in response to day length.

Detailed explanation-2: -Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism, which is also known as ‘skototropism’.

Detailed explanation-3: -Phototropism is the phenomenon by which the plant bends in the direction of light. Light is required by the plants to stimulate energy production by the process of photosynthesis.