I’m not sure if this is entirely correct but I’ve read online that plants ideally want a rest period after day light in order to properly grow and distribute nutrients throughout the plant. From my understanding of photosynthesis isn’t it an ongoing reaction so wouldn’t plants ideally want sunlight 24/7 if it doesn’t dry them out?
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In addition to the answers on here about resting and restoration periods, there is another reason. There is a group of plants known as C4 plants that do photosynthesis a bit differently. These plants tend to grow in hot, dry climates, and so they have an adaptation to help them survive. They only do part of photosynthesis during the day, enough to store carbon until later that night. Then, during the night, they open their pores (called stomata) in order to finish the second half of their photosynthesis, the portion that releases oxygen gas. By keeping their stomata closed during the day, these plants minime the amount of water their lose into the air on the hot, dry days of the climates they grow in.
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