Three friends were arguing. Richa said: "Plants do photosynthesis during the day time and respiration during night". Soniya said: "Plants take in oxygen and release carbon dioxide during night but they release oxygen and take in carbon dioxide during day time". Aarush said: "Plants take in carbon dioxide and release oxygen during both day and night". Whose statement is correct among the three friends? Justify.

The third friend is correct.

Explanation:

Plants use photosythesis whenever there is a powerful enough light source to do so. They use the ATP from photosythesis to drive cellular respiration, which is how they get large amount of ATP, photosythesis just get the correct materials needed to do so. And while phototsytheis does slow down significantly at night, some plants(like in the desert), do use it at night simply because those conditions are easier for the plant to use photosytheis. Keep in mind that photosythesis uses Carbon dioxide and releases oxygen, and in the calvin cycle, carbon is still used, and oxygen is used to a very minor extent.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.