Why Do Plants Take In Oxygen And Give Out Co2 At Night?

During daylight, plants are undergoing a process known as photosynthesis. In that the plants take up carbon dioxide and in the presence of light use it to manufacture sugars. From these sugars they can manufacture all other organic molecules. A by-product, actually more a waste product, of this reaction is oxygen, which is released by plants.

Now, consider this. All living things need to respire and the general equation for respiration says that glucose and oxygen give carbon dioxide and water. Plants are also living and do respire. Only at day time, they have sunlight and drive their energies into making food for themselves from carbon dioxide. At night, there is no sun. So, photosynthesis cannot work. However, the plants do have to respire. So, they do just that and we see that at night they are taking in oxygen and giving off carbon dioxide just like us!

Respiration takes place all the time so plants and animals need a steady supply of oxygen. During the day free plays need to carry out photosynthesis. Excess  oxygen is given off by plants into the air . At night respiration occurs much more rapidly  than photosynthesis . Hence both plants and animals take in oxygen by from the air for respiration  during the night however plants take in less oxygen during the night compared to the amount of they give out during the night. :)I hope this helped you BTW (by the way) I am new to this website so what are pints and what can we do by them pl z I need a thumb up help me please I am 13 years only!!!

The same way we breath in oxygen and exhale carbon dioxide, plants during the night, will do the same, but the process is reversed during the day, it takes in carbon dioxide and releases oxygen.  Interesting how plants can switch over that way.  It depends on what the plant needs during it's rest period, at night, and when it is in photosyntasism during the day, using sunlight to draw nourishment. I guess it's sort of like the way we eat food, take the nutrients we need, and expell the rest.

During day time plants needs food for survival as we all do so they take co2 for making food and thus this process known as photosynthesis and this they inhale co2 and exhale o2 ...they are also a living thing and they also need o2 for respiration so they do same work as we do all the time take o2 and exhale co2

The same way we  breath in oxygen and exhale carbon dioxide....

Other way round I think !

Plants sleep at night - and close their stomata - they cannot make food at night

They do photosynthesis so take in carbondioxide and give oxygen at night there is no sunlight so no photosynthesis so they take oxygen and give CO2

Actually! They don't need to produce CO2, it is just the absence of light which causes the plant to take in minimal amount of oxygen produce by themselves in order to respire which then, CO2 is produced.

Pie r squared seems like area to me,
if I need a circumference, I just use pie d :D