Extra 30 short questions and answers from Chapter:15 Air Around Us of Class 6 Science (CBSE):-
What is air made up of?
Answer:
Air is a mixture of gases, mainly
nitrogen (78%)
,
oxygen (21%)
, and small amounts of carbon dioxide, water vapor, and other gases.
Why is oxygen important for living beings?
Answer:
Oxygen is necessary for
respiration
in humans and animals, providing energy for survival.
How do plants take in carbon dioxide?
Answer:
Plants absorb carbon dioxide from the air through tiny openings in leaves called
stomata
during
photosynthesis
.
What is the percentage of nitrogen in the air?
Answer:
The air contains
78% nitrogen
, which helps in plant growth but is not directly used by animals or humans for breathing.
How does air help in burning?
Answer:
Oxygen in the air
supports combustion
, meaning things can burn only in the presence of oxygen.
What is the importance of nitrogen in the air?
Answer:
Nitrogen
dilutes oxygen
and prevents rapid burning. It is also used by plants to make proteins after being converted into nitrates.
Why do mountaineers carry oxygen cylinders?
Answer:
At high altitudes, the oxygen level is low, making breathing difficult. Oxygen cylinders help them breathe properly.
What is the role of carbon dioxide in the atmosphere?
Answer:
Carbon dioxide helps maintain the Earth’s temperature by trapping heat and is used by plants for photosynthesis.
How do aquatic animals breathe?
Answer:
Aquatic animals like fish use
gills
to absorb dissolved oxygen from water.
How does air help birds and airplanes to fly?
Answer:
The presence of
air pressure
and movement of air (
aerodynamics
) helps birds and airplanes to lift and fly
Why do we see dust particles floating in the air?
Answer:
Air contains
dust particles
that become visible when sunlight passes through them.
How does air pollution occur?
Answer:
Air pollution occurs due to
smoke from industries, vehicles, burning fuels, and deforestation
, releasing harmful gases.
What is the function of the ozone layer?
Answer:
The
ozone layer
in the atmosphere
protects Earth
by absorbing harmful
ultraviolet (UV) rays
from the Sun.
How does air support plant life?
Answer:
Air provides
carbon dioxide
for photosynthesis, oxygen for respiration, and
pollination
through wind.
Why do we need air to live?
Answer:
Air contains
oxygen
for breathing,
carbon dioxide
for plants, and
water vapor
for maintaining moisture.
What happens when air is heated?
Answer:
When heated, air
expands, becomes lighter, and rises
, creating wind movements.
What is wind?
Answer:
Moving air is called
wind
, and it is caused by the uneven heating of the Earth’s surface.
How do plants and animals maintain the balance of gases in the air?
Answer:
Animals breathe in
oxygen
and release
carbon dioxide
, while plants use carbon dioxide for
photosynthesis
and release oxygen.
What happens when air is compressed?
Answer:
Compressed air
occupies less space
and is used in balloons, car tires, and air pumps.
How does air help in cloud formation?
Answer:
Water vapor
in the air cools down and condenses into tiny water droplets, forming
clouds
.
How does wind help in seed dispersal?
Answer:
Wind carries
light seeds
from one place to another,
helping the
natural dispersal of plants.
What is humidity?
Answer:
The amount of
water vapor
present in the air is called
humidity
. High humidity makes the weather feel hot and sticky.
Why is air considered a natural resource?
Answer:
Air is essential for
breathing, photosynthesis, burning, flying, and weather changes
, making it an important natural resource.
What would happen if there were no air on Earth?
Answer:
Without air, there would be
no life
, no oxygen to breathe, no wind, and no sound transmission.
Why does a balloon expand when air is blown into it?
Answer:
Air
occupies space
and
exerts pressure
, which expands the balloon.
Why do some objects float while others sink in air?
Answer:
Objects lighter than air
float
, while heavier objects
sink
due to gravity.
How does wind energy help us?
Answer:
Wind energy is used to
generate electricity
, pump water, and move sailing boats.
What are the main gases present in air?
Answer:
Air is mainly composed of
nitrogen (78%)
,
oxygen (21%)
, and other gases like carbon dioxide, argon, and water vapor.
Why do candles go out when covered with a glass?
Answer:
The candle uses
oxygen for burning
, and when covered, the oxygen supply is cut off, causing it to extinguish.
How do dust storms occur?
Answer:
Strong winds lift
dust and sand
into the air, creating dust storms that reduce visibility and cause breathing problems.
