Answer the questions put against each of the following constituents of air :
A. Nitrogen : Explain its significance for plants and animals.
B. Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
C. Carbon dioxide : “Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air.” Support this statement with relevant facts.
D. Water vapours : Explain their role in modifying the earth’s climate.
Answer:A
Answer the questions put against each of the following constituents of air :
A. Nitrogen : Explain its significance for plants and animals. B. Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air. C. Carbon dioxide : “Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air.” Support this statement with relevant facts. D. Water vapours : Explain their role in modifying the earth’s climate.