AP BIOLOGY

Detailed explanation-1: -Plants can only undergo photosynthesis at night if they are exposed to the appropriate wavelengths of artificial light. With the help of the chlorophyll pigment, light energy is absorbed.

Detailed explanation-2: -In most plants, photosynthesis fluctuates throughout the day as stomata open and close. Typically, they open in the morning, close down at midday, reopen in late afternoon and shut down for good in the evening. Carbon dioxide is plentiful in the air, so it is not a limiting factor in plant growth.

Detailed explanation-3: -During the day, photosynthesis is dominant, so there is a net release of oxygen. At night, photosynthesis stops but respiration continues, so there is a net consumption of oxygen.

Detailed explanation-4: -Although different species have varying light requirements, no plant can tolerate continuous light exposure for 24 hours a day. Like nature’s cycle of light and dark, plants need a daily period of darkness and rest to remain healthy.

Detailed explanation-5: -Plants respire all the time because their cells need energy to stay alive, but plants can only photosynthesise when they are in the light.