Last updated on August 30th, 2023 at 10:30 pm
Air Around Us Class 6 Extra Questions and Answers
Air Around Us Class 6 Extra Questions and Answers | Class 6 Science Extra Question Answers | for all the students to prepare for exams…
Fill in the blanks:
Oxygen is necessary for the……. process. [Respiration]
…………. gas is produced in photosynthesis. [Oxygen]
Plants obtain nitrogen from ………… [Soil]
The rate of photosynthesis is very high during……. [Day]
The major component of air is………. [ nitrogen]
……… is required for the combustion of fuels. [oxygen]
……….. is an important component of all fertilizers? [nitrogen]
A layer of ………. protects humans from harmful radiation such as ultraviolet (UV) rays. [ Ozone]
A thick blanket of air is called …………. [Atmosphere]
Answer the following questions:
Question: Explain Air Composition?
Answer: In the air, there are many gases including nitrogen, which makes up 78% of the total volume. Oxygen occupies 21%. There are 0.03% of carbon dioxide and other gases in the remaining 1% of the air. Dust and water vapor are also present in the air.
Question: What are the different properties of air?
Answer: The different properties of air are
- Air is colorless and hence invisible.
- Air has mass
- Air exerts pressure
- Air can be compressed
- air occupies space.
Question: Why is the ozone layer important to the atmosphere?
Answer: A layer of ozone protects humans from the harmful effects of UV rays
Question: What are the most significant sources of air pollution?
Answer: The main sources of air pollution are as follows:
- Gases are released by industries and manufacturing.
- Fossil fuels and coal are burned.
- The burning of wood and the emission of smoke from vehicles.
- Volcanoes, dust storms, and forest fires are some natural causes of air pollution.
Question: How will you prove that oxygen is needed for burning?
Answer: Take a candle, a matchbox, and an empty glass tumbler. Light the candle and cover it with the inverted glass tumbler.
After a while, we will observe that the candle has been extinguished. This is due to the fact that when the candle is covered with a tumbler, the supply of oxygen is cut off, causing the candle to stop burning. This demonstrates that air supports combustion.
Question: Define air pollution. What are the primary effects of air pollution on living beings?
Answer: Air pollution refers to the contamination of air with undesirable substances such as harmful gases, chemicals, dust particles, and so on that may be harmful to living beings.
The following are the five most serious consequences of air pollution.
- Acid rain
- Respiratory diseases
- Global warming
- Depletion of the ozone layer
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