Question

it is advisable not to sleep under a tree at night .give reason
in support of this statement.

Answer 1

because at night trees release huge amount of carbon dioxide which is not good in excess for humans

Answer 2

it is advisable to not to sleep under a tree in night because in night, tree do not do photosynthesis. it only do respiration, in which it takes O2 and release CO2 do we must have deficiency of O2 in our body. but in day, plant do both respiration and photosynthesis.

I hope it will help you.