100+ UPSC Geography Atmosphere Questions and Answers Pdf - 2

Question: 6

How is nitrogen helpful for plants?

The bacteria in the soil absorb the nitrogen from the atmosphere and fix it to the soil. This nitrogen is used as food by plants. This nitrogen helps in the growth of plants. During lightning, nitrogen in the atmosphere mixes with oxygen to form nitrates. These nitrates combine with rain and come down in the form of dilute nitric acid. This diluted nitric acid reacts with calcium rocks to form calcium nitrates which are essential for plant growth.

Question: 7

Name the factors that increase the proportion of carbon dioxide in the atmosphere?

The continued burning of fossil fuel. Addition of vehicular emissions is the factors that increase the proportion of carbon dioxide in the atmosphere.

Question: 8

Write a note about dust present in the atmosphere?

The Dust is composed of salt particles from the oceans, pollen from plants, sand particles, ash etc. These dust particles are able to scatter 7 percent of energy coming from the sun. They also act as nuclei in the conversion of water vapour into water droplets.

Question: 9

What happens, when atmospheric temperature reduces?

When atmospheric temperature reduces, water vapour cools, condenses into water drops and comes down in the form of rain, snow and hail.

Question: 10

Write about the importance of water vapour present in the atmosphere?

Water vapour accounts for 2 to 3 percent of the atmosphere. The amount of water vapour in the atmosphere is very important for rains to fall.