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VII. Answer the following questions.
1. What is air? Mention its components with the help of a diagram.
2. Why is air important for us? Mention its other uses.
3. List any four properties of air.
4. How does deep breathing benefit us?
5. Differentiate between breathing and burning.
6. Define air pollution. List its causes.
7. Suggest any three preventive measures to keep the air clean.
Answers
Answer:
(1)The Composition of Air: Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts. Water vapor is also a constituent of air in varying amounts along with dust particles.
(2)Air is important for living things.
Breathing is part of a process called respiration. During respiration, a living thing takes in oxygen from the air and gives out carbon dioxide. This process gives animals and plants the energy to eat, grow, and live life!
(3)The properties of air are:
Air takes up space.
Air has mass.
Air is affected by heat.
Air exerts pressure.
Air can be compressed.
Air is affected by altitude.
(4)Taking deep breaths can help you voluntarily regulate your ANS, which can have many benefits — especially by lowering your heart rate, regulating blood pressure, and helping you relax, all of which help decrease how much of the stress hormone cortisol is released into your body.
(5)Respiration
Burning
1. It occurs at body temperature.
Occurs at higher temperature.
2. Respiration is a natural and continuous process.
Burning needs to be initiated and may or may not be a continuous process.
3. It is a series of chemical reactions which occur in a specific order.
It is a single step chemical reaction.
4. Enzyme dependent process.
Enzyme independent process.
(6)Air pollution is the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are different types of air pollutants, such as gases (such as ammonia, carbon monoxide, sulfur dioxide, nitrous oxides, methane and chlorofluorocarbons), particulates (both organic and inorganic), and biological molecules.
(7)Reduce the number of trips you take in your car. Reduce or eliminate fireplace and wood stove use. Avoid burning leaves, trash, and other materials. Avoid using gas-powered lawn and garden equipment.
Explanation:
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Answer:
1. What is air? Mention it's components with the help of a diagram.
Ans: The atmosphere of Earth is the layer of gases, commonly known as air, retained by Earth's gravity, surrounding the planet Earth and forming its planetary atmosphere.
There are 5 components of air-
a) Nitrogen ( 78% )
b) Oxygen ( 21% )
c) Argon ( 0.09 % )
d) Other gases ( 0.04% )
e) Carbon dioxide ( 0.03% )
2. Why is air important for us? Mention its other uses.
Ans: Living things need oxygen to survive because we can't survive without oxygen. It is vital that living things respire to get the oxygen for living cells to function. Without air, there is no life.
It's uses are-
a) Sustain life and growth.
b) Combustion.
c) Maintaining Temperature.
d) Supplier of Energy.
e) Photosynthesis.
3. List any four properties of air.
Ans: Any four properties of air are-
a) Air takes up space.
b) Air has mass.
c) Air is affected by heat.
d) Air exerts pressure.
4. How does deep breathing benefit us?
Ans: Taking deep breaths can help you voluntarily regulate your ANS, which can have many benefits — especially by lowering your heart rate, regulating blood pressure, and helping you relax, all of which help decrease how much of the stress hormone cortisol is released into your body
5. Differentiate between breathing and burning.
Ans: Breathing and burning, both are types of combustion , but, breathing takes place inside the body and helps in combustion of food with oxygen to produce energy, whereas burning can take place between any fuel and air(oxygen) due to any factor.
6. Define air pollution. List its causes.
Ans: Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities.
Causes of Air Pollution are -
a) The Burning of Fossil Fuels.
b) Industrial Emission.
c) Indoor Air Pollution.
d) Wildfires.
e) Microbial Decaying Process.
f) Transportation.
g) Open Burning of Garbage Waste.
h) Construction and Demolition.
7. Suggest any three preventive measures to keep the air clean.
Ans: a) Reduce the number of trips you take in your car.
b) Reduce or eliminate fireplace and wood stove use. c) Avoid burning leaves, trash, and other materials.