(a) Which gas is vital for the survival of all living organisms?

(b) Based on the above answer, explain how humans exchange gases?

(c) Name the process of burning of a substance in the presence of air.

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Solution

(a) Oxygen is the vital gas required for the survival of all living organisms.

(b) Humans respire through nostrils. We inhale oxygen from the atmosphere (produced by plants) and exhale carbon dioxide (required for plants).

(c) Combustion is the process of burning of a substance in the presence of air.

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Question 1
Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:
(a) Nitrogen
(b) Oxygen
(c) Ozone
(d) Argon

Oxygen is an essential gas required for the respiration of all living organisms.

(a) How does oxygen found present in water and soil?

(b) The gradual degradation of iron objects in the presence of the air is known as _____.

(c) Which constituents of air lead to damage of the iron objects?

Q. Air is a mixture of various gases. One of the gases is 21% part of the air and is essential for the survival of human beings. This gas is:

Question 1
Air is a mixture of various gases. One of the gases constitutes 21% part of the air and is essential for the survival of human beings. This gas is:
(a) Nitrogen
(b) Oxygen
(c) Ozone
(d) Argon

Q. Among the gases present in air, which one supports burning of a substance?

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(a) Which gas is vital for the survival of all living organisms? (b) Based on the above answer, explain how humans exchange gases? (c) Name the process of burning of a substance in the presence of air.

(a) Which gas is vital for the survival of all living organisms?

(b) Based on the above answer, explain how humans exchange gases?

(c) Name the process of burning of a substance in the presence of air.