With the rise in water termperature, dissolved oxygen

remains unchanged

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increases in amount

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decreases in amount

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is more available to the aquatic organisms

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Solution

The correct option is C decreases in amount
Dissolved oxygen (DO) can be defined as a measure of how much oxygen is dissolved in the water. It comes mainly from the atmosphere, also from photosynthesis by aquatic plants.The temperature, salinity and atmospheric pressure determine the amount of oxygen that can physically be dissolved into the water. Dissolved oxygen has an inverse (opposite) relationship with temperature.

If the temperature of water rises, the amount of dissloved oxygen decreases because the solubility of oxygen decreases as temperature increases.

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Similar questions

Q. Which one of the following is a correct statement?
(a) The amount of a solid that dissolves in water increases with a rise in temperature.
(b) The amount of a solid that dissolves in water at different temperatures is the same.
(c) The amount of different solutes that dissolve in water is always the same.
(d) The amount of a solute that dissolves in water decreases with a rise in temperature.

Assertion: Breathing rate in aquatic animals is high.

Reason: Availability of dissolved oxygen in water is high.

Q. Assertion (A): Thermal pollution is harmful to aquatic organisms.
Reason (R): Increase in temperature of water bodies reduces the dissolved oxygen level of the water.

Q. Aquatic animals use ______ dissolved in water to respire.

Question 27
Marked temperature changes in the aquatic environment can affect:

(a) breeding of animals
(b) more growth of aquatic plants
(c) process of digestion in animals
(d) availability of nutrients

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