Question

Nitrogen constitutes about \[78%\] percent of the atmosphere
A. By weight
B. By mass
C. By volume
D. None of these

Answer 1

Hint:The atmosphere is the layer that surrounds the Earth and is composed of varying gases. The common contents of the atmosphere are Nitrogen being the highest, oxygen, carbon dioxide, argon, water vapor, etc. the atmosphere of Earth is just the right composition to support the diverse life forms. The quantity is different for different atmospheric gases.

Complete answer:The atmosphere of the Earth is its outermost layers that are made up of various kinds of gases. Each of the gases has a specific role to play in sustaining the stable environment of the Earth. The various gases of the atmosphere consist of Nitrogen, carbon dioxide, oxygen, argon water vapor, etc. Nitrogen is the most abundant gas of the Earth’s atmosphere represented as \[78%\] percent of the Earth’s atmosphere.
The amount of gases in the atmosphere is measured by the quantity they occupy in the atmosphere. This means that the measuring unit for gases is the percent by volume of the gases present in the atmosphere. Hence, the measure of \[78%\] percent nitrogen indicates its volume. Oxygen is $21%$ percent by volume, carbon dioxide is $0.03%$ percent by volume, and argon is about $0.9%$ percent by volume. Other gases are present in very minute compositions. Nitrogen is used by nitrogen-fixing bacteria and by lightning. This results in ammonia production which is used in the construction of amino acids and nucleotides. Plants also use fixed nitrogen to enhance their development and growth.
Thus, the right answer is option C. By volume

Note: The atmosphere of a plant depends on its gravitational pull. The Earth exerts just the right pressure and provides just the right amount of temperature to sustain a stable atmosphere. The atmosphere is divided into different zones based on the height and the composition of the zones. Each of the atmospheric zones has a specific role to play.