MEDIUM
Earn 100

What role do organisms play in the water cycle?

Important Questions on Water: A Precious Resource

MEDIUM
Science>Chemistry>Water: A Precious Resource>Water Cycle
Which of the following is not a pollutant?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
When it rains heavily, it is easy to find earthworms in the garden. Why?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
Why do plants need nitrogen?
EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Which gas is given to the patients having breathing problems?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
What is the importance of water vapour in the air?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
How will you show that air (or oxygen) is necessary for burning?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
Explain why, if the clothes of a person catch fire accidently, he is covered with a woollen blanket. Give reason for your answer.
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Science>Chemistry>Water: A Precious Resource>Water Cycle

Which gas is needed for fire to burn?

EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Which of the following is necessary for burning things?
Argon, Carbon dioxide, Oxygen, Nitrogen, Helium
EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Name the major component of the air
EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Apart from nitrogen and oxygen, name two other gases present in the air.
MEDIUM
Science>Chemistry>Water: A Precious Resource>Water Cycle
State the Importance of carbon dioxide for living things?
EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Which component of air acts as a supporter of combustion?
EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle

Explain why a burning candle stops burning after some time when covered with an inverted gas jar.

HARD
Science>Chemistry>Water: A Precious Resource>Water Cycle

Study the picture and answer the questions.

Question Image

(i) Will the flame of the candle go out at once? Why or why not?

(ii) Will the water start boiling after some time? Why or why not?

(iii) Will the candle flame go out after some time? Why or why not?

(iv) If you hold the inverted glass jar so that it covers the candle flame but its rim is above the water level, what will happen?

EASY
Science>Chemistry>Water: A Precious Resource>Water Cycle
Which gas in the atmosphere is essential for respiration?
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Science>Chemistry>Water: A Precious Resource>Water Cycle
Name any one component of air which does not support burning.
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Science>Chemistry>Water: A Precious Resource>Water Cycle
Cotyledons are also called-
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Science>Chemistry>Water: A Precious Resource>Water Cycle
The air that we breathe in is rich in carbon dioxide.
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Science>Chemistry>Water: A Precious Resource>Water Cycle
Name the component of air which condenses on a cold surface to form drops of a liquid. What is this liquid?