Question

multiple - choice question
when is it \safe\ for a cacti to open the stomata?
during the day
during the night
rewatch

Explanation:

Cacti are succulent plants that live in arid environments. Stomata are tiny pores on the surface of plant leaves and stems that allow for gas exchange (taking in carbon dioxide and releasing oxygen) but also result in water loss. During the day, the desert environment is hot and dry. If cacti opened their stomata during the day, they would lose a large amount of water through transpiration, which could be detrimental to their survival. At night, the temperature drops, and the humidity is relatively higher. Opening stomata at night allows cacti to take in carbon dioxide for photosynthesis (they use a special type of photosynthesis called Crassulacean Acid Metabolism - CAM) while minimizing water loss.

Answer:

during the night