Refer to the given flow chart and select the incorrect statement regarding P, Q, R and S.

Options

A. Presence of R in air is important for the occurrence of water cycle in nature.
B. P could be a gas that is a by-product of photosynthesis done by plants.
C. Q could be a gas that is used in fire extinguishers.
D. S forms 0.03% of the air in the Earth's atmosphere.

Answer

D

Explanation

According to the given flowchart P, Q, R and S are constituents of air. P supports burning, hence P can be oxygen. Q and R do not support burning. Q causes global warming and is also used by green plants during photosynthesis, hence Q can be carbon dioxide. R causes global warming and it enters the air through transpiration but it is not used by green plants during photosynthesis, hence it could be water vapour. S neither supports burning not it causes global warming, hence it could be a non-greenhouse gas like nitrogen, hydrogen, etc. Carbon dioxide forms 0.03% of the air in the Earth.s atmosphere and S is not carbon dioxide.