Air Around Us
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Composition of Air
SubtopicComposition of Air under Air Around Us for Grade 6 CBSE.
Preview questions (no answers)
- 1.
Which component of air do humans and animals primarily take in for survival during breathing?
A.Nitrogen
B.Carbon dioxide
C.Oxygen
D.Water vapor
- 2.
Air is a form of matter because it:
A.Is invisible
B.Has mass and occupies space
C.Is always cold
D.Has no weight
- 3.
Plants require which gas from the air to perform photosynthesis?
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Argon
- 4.
If we heat a beaker of water, we see tiny bubbles appearing on the sides before the water starts boiling. These bubbles are:
A.The water turning into gas
B.Dissolved air coming out of the water
C.Dust particles moving
D.Tiny pieces of glass
- 5.
Air is considered a mixture because:
A.Its composition can vary slightly in different places
B.It has a fixed chemical formula like
C.It is always found in a liquid state
D.It is made of only one type of gas
- 6.
During respiration, which change occurs in the composition of the air we breathe out compared to the air we breathe in?
A.Oxygen increases and Carbon dioxide decreases
B.Oxygen decreases and Carbon dioxide increases
C.Nitrogen increases and Oxygen decreases
D.Nitrogen decreases and Carbon dioxide increases
- 7.
Windmills are NOT used for which of the following purposes?
A.To draw water from tube wells
B.To run flour mills
C.To generate electricity
D.To produce oxygen from the air
- 8.
How does the air composition inside a soil sample change immediately after a heavy flood?
A.The amount of Oxygen increases
B.The air spaces are filled with water, reducing available air for organisms
C.Nitrogen gas turns into liquid
D.Dust particles disappear completely
- 9.
Which of the following is true about the air dissolved in water?
A.It has more Nitrogen than atmospheric air
B.It contains more Oxygen relative to Nitrogen than atmospheric air does
C.It contains no Carbon Dioxide
D.It is exactly the same in composition as atmospheric air
- 10.
In a laboratory, if we remove all the Oxygen from a closed chamber containing air, which of these events will still be possible?
A.A matchstick can be lit
B.A mouse can survive
C.An electric fan can rotate when switched on
D.A candle can continue to glow
Download the worksheet for Air Around Us - Composition of Air to practice offline. It includes additional chapter-level practice questions.
Oxygen Cycle and Photosynthesis
SubtopicOxygen Cycle and Photosynthesis under Air Around Us for Grade 6 CBSE.
Preview questions (no answers)
- 1.
During photosynthesis, carbon dioxide enters the leaf through:
A.The stem
B.The roots
C.The stomata
D.The flowers
- 2.
Which process ensures that oxygen used by living beings is constantly replaced?
A.Digestion
B.Photosynthesis
C.Excretion
D.Circulation
- 3.
Which of the following gases is NOT part of the basic photosynthesis equation?
A.Carbon dioxide
B.Oxygen
C.Nitrogen
D.Water vapor
- 4.
Which of the following parts of the plant is NOT usually involved in photosynthesis?
A.Green leaves
B.Green stems
C.Roots
D.Sepals
- 5.
What is the final step in the cycle that allows oxygen to be used again by animals after it has been turned into carbon dioxide?
A.Combustion
B.Photosynthesis
C.Respiration
D.Digestion
- 6.
In the process of making food, plants convert and into sugar. Where is the 'energy' for this conversion stored initially?
A.In the roots
B.In the chemical bonds of glucose
C.In the oxygen released
D.In the soil
- 7.
Which part of the atmosphere contains the majority of the oxygen involved in the oxygen cycle?
A.Exosphere
B.Troposphere
C.Stratosphere
D.Mesosphere
- 8.
In the context of the Oxygen Cycle, what is the 'compensation point' for a plant?
A.The point where the plant dies from too much oxygen.
B.The level of light intensity where the rate of photosynthesis exactly matches the rate of respiration.
C.The amount of water needed to produce one molecule of oxygen.
D.The maximum altitude at which a plant can produce oxygen.
- 9.
What is the primary function of the molecules consumed during the process of cellular respiration?
A.To be converted into sugar.
B.To act as a building block for leaves.
C.To help break down glucose and release the energy stored in its chemical bonds.
D.To make the organism weigh less so it can move faster.
- 10.
A deep-sea diver notices that there are no plants at the very bottom of the dark ocean. How do organisms there get the oxygen they need for the Oxygen Cycle?
A.They perform photosynthesis using the heat from volcanic vents.
B.Oxygen from the surface dissolves in the water and is carried to the deep ocean by cold, sinking currents.
C.The animals there have evolved to live without oxygen.
D.They get oxygen by eating rocks.
Download the worksheet for Air Around Us - Oxygen Cycle and Photosynthesis to practice offline. It includes additional chapter-level practice questions.
Importance of Air for Living Beings
SubtopicImportance of Air for Living Beings under Air Around Us for Grade 6 CBSE.
Preview questions (no answers)
- 1.
Which living being is primarily responsible for returning oxygen back to the air?
A.Humans
B.Insects
C.Green plants
D.Fish
- 2.
Which of the following make up the remaining 1% of the air (besides Nitrogen and Oxygen)?
A.Only carbon dioxide
B.Only water vapor
C.Carbon dioxide, water vapor, and noble gases
D.Hydrogen and Smoke only
- 3.
Air helps in the movement of which of the following?
A.Sailing yachts
B.Gliders
C.Parachutes
D.All of these
- 4.
In a closed room, if some material is burning, we feel suffocated due to the accumulation of:
A.Oxygen
B.Nitrogen
C.Carbon dioxide
D.Water vapor
- 5.
Aquatic animals like prawns and crabs obtain the oxygen they need for survival from:
A.The air trapped in their shells
B.The oxygen dissolved in water
C.The water molecules they break down
D.The plants they eat
- 6.
A 'firki' (toy pinwheel) rotates when we hold it in an open area on a windy day. This rotation is caused by:
A.The heat of the sun
B.The pressure of the moving air
C.The gravitational pull of the Earth
D.The magnetic field of the Earth
- 7.
If a living mouse is kept in a completely airtight container, what will happen to the level of oxygen inside over time?
A.It will increase
B.It will decrease
C.It will remain constant
D.It will be replaced by nitrogen
- 8.
Which of these is a major difference between the way air is used by a burning candle and a living bird?
A.The candle uses nitrogen, while the bird uses oxygen.
B.The candle produces oxygen, while the bird produces carbon dioxide.
C.The candle's use of air is a chemical process of combustion, while the bird's is a biological process of respiration.
D.The candle does not need air to stay 'alive', but the bird does.
- 9.
During a forest fire, animals often flee the area. Apart from the heat, what is the most immediate danger related to air?
A.The lack of nitrogen in the air.
B.The rapid depletion of oxygen and the buildup of toxic smoke and carbon dioxide.
C.The air becomes too light for them to walk on.
D.The wind stops blowing, making it impossible to breathe.
- 10.
What would be the effect of increased smoke and dust in the air on the health of living beings?
A.It would increase the amount of oxygen available for breathing.
B.It would lead to respiratory diseases and reduce the efficiency of photosynthesis in plants.
C.It would help plants grow faster by providing more nutrients through the leaves.
D.It would make the air cleaner by absorbing excess water vapor.
Download the worksheet for Air Around Us - Importance of Air for Living Beings to practice offline. It includes additional chapter-level practice questions.