AP BIOLOGY

Detailed explanation-1: -Water is lost from the aerial regions of plants in the form of water vapor through a biological process, it is called transpiration. Since stomata are closed at night, it is generally believed that transpiration only happens during the day.

Detailed explanation-2: -Plants grow and transpire water during the day and night. Recent work highlights the idea that night-time transpirational water loss is a consequence of allowing respiratory CO2 to escape at sufficiently high rates through stomata.

Detailed explanation-3: -During daytime in the sunlight, the rate of transpiration is faster. This is because the stomata remains open to allow the inward diffusion of carbon dioxide for photosynthesis. During dark, the stomata are closed, and hence transpiration hardly occurs at night.

Detailed explanation-4: -Plant respiration occurs 24 hours per day, but night respiration is more evident since the photosynthesis process ceases. During the night, it is very important that the temperature is cooler than during the day because plants can experience stress.

Detailed explanation-5: -Stomata are generally closed at night time. It is to avoid excessive loss of water. Also, plants require water to perform photosynthesis, which does not occur during the night, since, sunlight is not available. Therefore, the transpirational pull is not required to transport water up to the leaves of the plant.