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Question

The given diagram shows percentage composition of gases P,Q,R and other gases present in air.
Which of the following statements is/ are correct regarding gases P,Q and R?
(i) P can be fixed in soil by certain bacteria present in roots of leguminous plants.
(ii) P supports combustion whereas Q and R help in extinguishing fire.
(iii) Plants and animals release R in respiration whereas plants use Q in photosynthesis.
(iv) R entraps sun's heat and makes earth warm and hospitable.
811494_4daa3bf34c9c48ccaa741604de5fbb65.jpg

A
(i) and (iv) only
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B
(ii) and (iii) only
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C
(i), (ii) and (iv) only
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D
(iii) only
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Solution

The correct option is A (i) and (iv) only
According to figure P is nitrogen and nitrogen can be fixed in soil by certain bacteria present in roots of leguminous plants, and Q is oxygen and R is carbon-dioxide which entraps sun's heat and makes earth warm and hospitable.

1350958_811494_ans_e75e7f1151294a86b0c365490b97e35d.PNG

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