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A fish dies when it is put in an aquarium filled with previously boiled water but cooled to room temperature. This happens because the water in the aquarium is:
1. Depleted in minerals
2. Depleted in oxygen
3. Unfit for drinking by fish
4. Unfit for swimming by fish

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Correct Answer - Option 2 : Depleted in oxygen

Concept:

  • All living organisms need oxygen to live.
  • Plants and animals directly take up oxygen from the air.
  • Fish, like all other complex life forms, need oxygen to survive.
  • They get theirs in the form of oxygen gas dissolved in the water.

​Explanation:

  • Boiling creates bubbles that contain dissolved oxygen.
  • When boiling the water the dissolved oxygen present in the water decreases.
  • An increase in temperature results in decreased levels of dissolved oxygen in the water.
  • This can harm aquatic animals such as fish, amphibians and other aquatic organisms.
  • Cooling the water to room temperature speeds up the process of oxygen dissolution in the water.
  • However, for higher dissolved oxygen level in the aquarium water more mixing and agitation are required.
  • That's why it's important to have an aeration device, a bubbler, in the aquarium.

Thus, the fish dies when it is put in an aquarium filled with previously boiled water but cooled to room temperature because it is depleted of oxygen.

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