16 Questions
What is wind called when it is in motion?
Air in motion
Which gas is a major portion of our atmosphere?
Nitrogen
What is the envelope of air that surrounds the earth known as?
Atmosphere
What does smoke consist of?
Dark-colored gases from burning
What does carbon dioxide support?
Respiration
What shows the direction in which the air is moving at a specific place?
Weathercock
Which gas supports burning in the air?
Oxygen
What is the main gas present in the air?
Nitrogen
What is the percentage of carbon dioxide in the air?
0.03%
What do animals take in from the air during respiration?
Oxygen
How do plants use carbon dioxide from the air?
To make their own food by photosynthesis
Where is carbon dioxide produced when burning something?
In the air
What do wet clothes drying on a clothesline indicate about the presence of water vapour?
The water forms water vapour and mixes with the air
What process takes place when glucose in the body breaks down to give energy?
Respiration
Apart from dust particles, what else does air contain?
Smoke released from factories and vehicles
Which gas is used by plants and animals for respiration?
Oxygen
Study Notes
Atmospheric Concepts
- Wind in motion is called airflow.
- Nitrogen is the major portion of our atmosphere, making up about 78% of the air.
- The envelope of air that surrounds the Earth is known as the atmosphere.
Composition of Air
- Smoke consists of particles suspended in the air.
- Carbon dioxide supports burning in the air.
- Oxygen is the main gas present in the air, making up about 21% of the atmosphere.
- Carbon dioxide makes up about 0.03% of the air.
Respiration and Photosynthesis
- Animals take in oxygen from the air during respiration.
- Plants use carbon dioxide from the air during photosynthesis to produce glucose.
- Carbon dioxide is produced when burning something, such as wood or fossil fuels.
Water Vapour
- Wet clothes drying on a clothesline indicate the presence of water vapour in the air.
- Air contains water vapour, apart from dust particles.
Cellular Respiration
- When glucose in the body breaks down to give energy, cellular respiration takes place.
Biological Roles of Gases
- Oxygen is used by plants and animals for respiration.
- Carbon dioxide is used by plants during photosynthesis.
Explore NCERT Class 6 Science Notes Chapter 15 'Air Around Us' for quick revision. Learn about the properties of air, the concept of wind, and the importance of air for living organisms. Download the PDF for free to deepen your understanding.
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