HORTICULTURE

Detailed explanation-1: -If the stem grows towards the sunlight, it is called as positively phototropic movement. It is a tropic movement induced in the plant, in response to the stimuli called as light. Whereas, the growth of root is negatively phototropic.

Detailed explanation-2: -While gravitropism is the predominant tropistic response in roots, phototropism also plays a role in the oriented growth in this organ in flowering plants. In blue or white light, roots exhibit negative phototropism, but red light induces positive phototropism.

Detailed explanation-3: -One important light response in plants is phototropism, which involves growth toward-or away from-a light source. Positive phototropism is growth towards a light source; negative phototropism is growth away from light.

Detailed explanation-4: -Growth or movement towards a light source is positive phototropism. Stem and leaves show positive phototropism whereas root shows negative phototropism.