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?

The bubbles come from dissolved air in water.

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The bubbles are water bubbles.

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The liquid in the beaker is not water.

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The bubbles are formed due to glass vessel.

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Solution

The correct option is A The bubbles come from dissolved air in water.
The bubbles come from the air dissolved in water. When Sam heated the water, the air dissolved in it escaped which came out in the form of bubbles. As he continued heating, the water itself turns into vapour and finally begins to boil. The animals living in water use the dissolved air in water for respiration.

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Similar questions

An experiment was performed to know about the source of air for the aquatic organisms. The experiment was as follows:

Take some water in a glass vessel. Heat it slowly on a tripod stand. Before the water begins to boil, look carefully at the inner surface of the vessel. Observe the bubbles that are coming up. Where are these bubbles coming from?

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?

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 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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