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, 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-3: -Plants grow and differentiate to optimize their space, using light in a process known as photomorphogenesis. Plants grow and move toward or away from light depending on their needs; this process is known as phototropism.

Detailed explanation-4: -An example of a plant that is highly phototrophic is the sunflower (Helianthus annus). Not only do sunflowers grow toward the sun, they can be visibly seen to track the sun’s movements from East to West throughout the day.

Detailed explanation-5: -Photoperiodism is the response to changes in daylength that enables plants to adapt to seasonal changes in their environment. The best studied example of photoperiodism in plants is flowering, but other responses to daylength include bud dormancy and bulb or tuber initiation.