AP BIOLOGY

Detailed explanation-1: -Light sensing in plants involves special molecules called photoreceptors, which are made up of a protein linked to a light-absorbing pigment called a chromophore.

Detailed explanation-2: -A plants response to light has been well documented and studied. It is known to be due to differential elongation of the cells in the plant stem. Stem cells away from the light elongate in response to special auxins (growth hormones) causing the plant stem to bend towards the light.

Detailed explanation-3: -The movement of a plant part in response to light is called phototropism. The plant’s shoot shows positive phototropism whereas, the plant’s root show negative phototropism.