AP BIOLOGY

Detailed explanation-1: -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. As discussed above, phototropic response is exclusively controlled by phots.

Detailed explanation-2: -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-3: -The correct option is B Positive Phototropism. Movement of plants in response to light is called Phototropism. In this case, light is a stimulus to which the plant can show two responses: i) It can move towards the light source-positive phototropism.

Detailed explanation-4: -Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots.

Detailed explanation-5: -Phototropism is the movement of plants towards or away from light. If the plant part moves towards the light it is called as positive phototropism. If the plant part moves away from the light it is called as negative phototropism.