Question

Name the gas excreted by the plants during the night time.
A. \[CO\]
B. \[C{O_2}\]
C. \[{O_2}\]
D. \[N{O_2}\]

Answer 1

Hint: The process of respiration occurs in humans, plants and all the living beings but the gases which are exchanged during respiration remain the same in all of the living organisms without any change.

Complete answer:
The plants release oxygen and utilizes the carbon dioxide from the environment during its course of respiration. It is the process of photosynthesis which is affected by the availability of the light because light provides plants the source of energy which will help plants produce their food. Photosynthesis has no relation with the type of gas which is being released from the plants or is being used by the plants. We humans also respire \[24\] hours but the day and night criteria do not affect the respiratory gases. So even at night the plant will release oxygen only. From the concept of respiration of plants it is clear that plants release carbon dioxide only as the exchange of gases occurs. Now, one of the option which is \[CO\], we all know that carbon monoxide is a harmful gases for both plants and animals and plant always take up carbon dioxide and utilise it in formation of energy by utilising the carbon so in any case the carbon will not release any gas which is having a carbon molecule.

Hence, the correct answer is option (C).

Note: The word excretion means the gas which is being released by the plant and not the gas which is being consumed. Plants require \[N{O_2}\]to perform some functions but it has nothing to do with the respiration.