ECOLOGY
CHEMICAL CYCLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cellular respiration occurs only at night and not during the day.
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Cellular respiration occurs at a faster rate at night than during the day.
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Photosynthesis uses some of the carbon dioxide released during the day.
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The light-independent reaction of photosynthesis that releases carbon dioxide occurs at night.
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Detailed explanation-1: -But during the day, the amount of carbon dioxide released is much less than the amount required for photosynthesis. So, plants take in carbon dioxide from the atmosphere for preparing food. At night, photosynthesis does not occur hence they take in oxygen and give out carbon dioxide.
Detailed explanation-2: -Plants excrete more carbon dioxide at night compared to during the day because they cannot do photosynthesis at night. Photosynthesis requires sunlight. So, during the day plants take in carbon dioxide and water and use sunlight to do photosynthesis to make oxygen and glucose.
Detailed explanation-3: -Since photosynthesis requires sunlight, it occurs only in the daytime, which thus means that plants give out oxygen during the day. Plants give out carbon dioxide during respiration, which takes place during the day as well as at night.
Detailed explanation-4: -During the daytime, plants neither take in oxygen nor release carbon dioxide. This is because oxygen which is produced during photosynthesis is used for burning food. Carbon dioxide produced during respiration is used in photosynthesis. But at night, plants also take in oxygen and give out carbon dioxide like animals.
Detailed explanation-5: -Then at night or during autumn and winter, plants reduce or even stop photosynthesising, releasing carbon dioxide back into the air. This is often called the natural carbon cycle.