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_____________.

Combustion

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Evaporation

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Condensation

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Distillation

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Solution

The correct option is A
Combustion

Oxygen is the most important component of air, it is used by living organisms and plants during respiration. It also supports combustion. Combustion occurs only in the presence of oxygen.

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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_____________.

Sam and John found it interesting to discuss about air. Sam further stated that air is one of the most important things that is required for the existence of life on earth as air is needed for respiration. John was not in agreement with Sam on this statement and argued that the organisms that are found in rivers, oceans and other water bodies do not have access to air but still they continue to live.

Which of the following can be an explanation for John's query?

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

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 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?

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The correct option is A Combustion Oxygen is the most important component of air, it is used by living organisms and plants during respiration. It also supports combustion. Combustion occurs only in the presence of oxygen.

The correct option is A
Combustion

Oxygen is the most important component of air, it is used by living organisms and plants during respiration. It also supports combustion. Combustion occurs only in the presence of oxygen.