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?

Air is present in water in dissolved form.

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Aquatic animals do not respire.

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Aquatic animals do not require air for respiration.

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Aquatic animals use water for respiration.

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Solution

The correct option is A
Air is present in water in dissolved form.

Air is present at every place where there is life. In rivers, seas, oceans and other water bodies air is present but not as it is available on the surface of the earth but in dissolved form. Yes air is present in water bodies in dissolved form and aquatic animals use their gills for extracting dissolved air in water. Some aquatic animals may even use their skin for extracting air from water and thus Sam is correct with his statement that 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.

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Similar questions

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 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?

Based on the observations made by John in the previous question, Sam concluded that air occupies space, but John was skeptical and argued that how can anything occupy space if it is not visible. State whether Sam's conclusion is true or false.

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?

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