Sam asked Kenneth 'Now that you know about the composition of air, can you tell us (Sam and John) why the composition of air varies from place to place?' Kenneth began to think as he had no answer for this question. But having developed a reasonable idea about air and its properties John was able to connect the dots and gave a quick and loud answer.
What was John's answer?

It is due to the smoke and gases emitted by the automobiles along with dust particles present in the air.

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It is due to the fact that earth is spherical in shape.

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It is due to the oceans and rivers.

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It is due to the fact that we continuously consume air.

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Solution

The correct option is A
It is due to the smoke and gases emitted by the automobiles along with dust particles present in the air.

The composition of air varies from place to place because of the presence of industries in some places and their absence at other places. Factories emit gases that become a part of the atmosphere and thus affect the composition of air. Smoke and gases emitted by the automobiles along with dust particles present in the air also play an important role in altering the composition of air.

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John and Sam were soon joined by their common friend Kenneth. Kenneth got to know about the discussion John and Sam were having. He too wanted to share some of his knowledge about air and asked to join the conversation. Sam and John both welcomed him and started firing questions on him.

Sam: Kenneth, do you know about the composition of air?

Kenneth: Yes, I do! it is a mixture of gases, water vapour and dust particles.

Sam: Fine, can you tell us its composition?

Kenneth: Hmmm, I am not sure about that.

Sam: Okay, just tell us the major components of air.

So can you answer the last question that was asked to Kenneth?

Sam was impressed by John's quick answer and asked him another question somewhat related to the previous question itself.

Sam: John, now that you know so much about air around us, can you tell us which components of air is harmful for living beings?

John: I am not exactly sure about this, Kenneth, please help me answer this.

Kenneth: Oh yes, I can surely help you answer this question.

What was Kenneth's answer?

Kenneth was now able to recall some of the things that were taught to him in his class. John was still curious and having gathered so much information from Sam, he now had a better idea about air. He was able to connect the dots. He further asked 'If air is composed of so many gases, which of these is used by us and the other organisms during respiration?' Kenneth said he had the answer for his question.

Which of the following is a plausible answer to the above question?

Kenneth wanted to interact more with John and Sam and hence decided to ask more about the composition of air. He asked John and Sam ' what is the exact composition of air?' Sam being the man with information took the liberty to explain him that the composition of air is not fixed everywhere and it varies from place to place but we can have a rough estimate of its composition. Sam further went ahead to make the following table.

Sam further went on to match the components in column I with the percentage by volume in column II as per the composition of air. Which of the following options are correct for the above table

Kenneth explained about the most important component of air to John and Sam. John was satisfied with the answer but Sam wanted to add some more information to it. Sam further elaborated the properties of the most important component of air. He said, it is not only used by living organisms during respiration but it also supports_____________.

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