AP BIOLOGY

Detailed explanation-1: -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-2: -What is Phototropism? “Photo” means light, and “tropism” means turning. 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.

Detailed explanation-3: -Phototrophic movement is the response of plants towards light. If the plant part moves towards the light it is called positive phototropism. If the plant part moves away from the light it is called negative phototropism.

Detailed explanation-4: -Phototropism is the ability of the plant to re-orient the shoot growth towards a direction of light source. Phototropism is important to plants as it enhances the ability of plants to optimize their photosynthetic capacity.

Detailed explanation-5: -There are two types of phototropism: positive and negative. Positive phototropism is growth toward a light source, and negative phototropism is growth away from a light source. Plant roots tend to exhibit negative phototropism, because they need to grow deeper into the ground for plant stability, water, and nutrients.