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Question
What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.
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Solution
A blanket of air around earth is called the atmosphere. Without an atmosphere, life would not be possible, as the atmosphere protects us from harmful gases. We could not live without the air present in the atmosphere. In the absence of the atmosphere, the earth would get so cold at night that we would not be able to survive. No \[\ce{CO2}\] and \[\ce{N2}\] for plants without atmosphere.
RELATED QUESTIONS
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
Fill in the blank
Air is a ______ of gases
Describe a simple experiment with the help of a diagram to show that Air occupies space
Water does not have a ______ but has definite ______ and ______.
Air has variable composition and hence there is ______ oxygen at lower altitudes than at higher altitudes.
Complete the statement given below by filling in the blank with the correct word/s from the word/s given below
____________ is an example of a pollutant present in the air.
______ is important for all living creatures.
Match the items of Column I with the items of Column II
| Column I | Column II | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of air flow |
| (e) | Wind | (v) | Prevent dust particles |
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Why did the tiny bubbles appeared?
