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?

Oxygen

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Nitrogen

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Carbon dioxide

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Water vapours

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Solution

The correct option is A
Oxygen

The most important component of air for us is oxygen. We use oxygen during respiration. When we inhale air our lungs absorb oxygen from air and transfer it to blood. This oxygen is used in the digestion of food and many other biological processes.

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Similar questions

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?

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_____________.

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?

John was still not satisfied with the explanation given by Sam regarding organisms that live underwater for most or all of their life. So he asked Sam to demonstrate his explanation physically so that he can have a better understanding. John simply wanted to know about the source of air for the aquatic animals.

Sam decided to use an experiment to explain John so he performed the following experiment.

He took some water in a glass vessel. Heated it slowly on a tripod stand. Well before the water began to boil, he asked John to look carefully at the inner surface of the vessel. John observed that bubbles were coming up.

John asked 'where did these bubbles come from'?

Which of the following can be Sam's answer?

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?

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The correct option is A OxygenThe most important component of air for us is oxygen. We use oxygen during respiration. When we inhale air our lungs absorb oxygen from air and transfer it to blood. This oxygen is used in the digestion of food and many other biological processes.

The correct option is A
Oxygen

The most important component of air for us is oxygen. We use oxygen during respiration. When we inhale air our lungs absorb oxygen from air and transfer it to blood. This oxygen is used in the digestion of food and many other biological processes.