Why do plants excrete more carbon dioxide at night than during the day?

a. cellular respiration occurs only at night and not during the day.
b. cellular respiration occurs at a faster rate at night than during the day.
c. photosynthesis uses some of the carbon dioxide released during the day.
d. the light-independent reaction of photosynthesis that releases carbon dioxide occurs at night.

Respiration and photosynthesis both occur during the day. However, at night only respiration occurs which consumes oxygen.

Answer;

C. Photosynthesis uses some of the carbon dioxide released during the day.

Explanation;

-Cellular respiration is the process of conversion of food into energy. In this process, CO2 is formed and O2 is used. Photosynthesis on the other hand, is the process of formation of food by absorbing CO2 and releasing O2 as byproducts in plants.

-During day time, plants perform photosynthesis (since sunlight is present). Thus, plants use their own CO2 released by respiration process. Thus, during day time, plants give out more of O2 compared to CO2.

-However, during night time, plants perform only respiration and no photosynthesis (since absence of sunlight). Thus concentration of CO2 released is higher during night time.

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