Name: Composition of Air
Uploaded: 2019-07-19
Duration: 4 min 59 s
Description: Air consists of many gases such as oxygen, nitrogen, hydrogen and many more. But do you know how these constituents of air were discovered and by whom? Find...

Question

Is it good to sleep under a tree (a) during the day, (b) at night? Give reasons.

Accepted Answer

Respiration in leaves occurs during the day time as well as at night. But photosynthesis occurs only during the day time. So, the net gaseous exchange in plants is as:-
(a) During day time, when photosynthesis occurs, oxygen is produced. The leaves use some of this oxygen for respiration and the rest of the oxygen diffuses out in the air. Similarly, the carbon dioxide produced during respiration is all used up in photosynthesis by leaves. Even more carbon dioxide is taken from the air. So, net gas exchange becomes- oxygen diffuses out and carbon dioxide diffuses in.

(b) During nighttime, when no photosynthesis occurs and no oxygen is produced, oxygen from air diffuses into the leaves to carry out respiration. And carbon dioxide produced by respiration diffuses out into the air. So, net exchange becomes- oxygen diffuses in and carbon dioxide diffuses out.
Therefore, it is suggested not to sleep under the tree during night as it releases carbon dioxide at night which is harmful for our health.

Is it good to sleep under a tree (a) during the day, (b) at night? Give reasons.

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