Refer to the given flow chart and select the incorrect statement regarding P, O, 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, Rand 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. Sneither 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.