DENDROLOGY

Detailed explanation-1: -Growth in response to light is known as Phototropism. The process of phototropism is regulated by a Plant growth regulator called Auxin. Auxin reacts when light falls on the surface. In positive phototropism, the direction of plant growth is towards the direction of light.

Detailed explanation-2: -Phototropic responses, or a plant’s ability to reorient organ growth toward (positive phototropism) or away (negative phototropism) from a directional light source, has fascinated researchers for well over a century (Holland et al., 2009).

Detailed explanation-3: -When the plant has the ability to grow away from the light or they grow towards the darkness, this is called negative phototropism. For example-Vine and Arabidopsis.