UPSC Civil Services Model Paper 3

● The elevated temperature typically decreases the level of dissolved oxygen of water. Hence statement 1 is correct.
● This can harm aquatic animals such as fish, amphibians and other aquatic organisms.
● Thermal pollution may also increase the metabolic rate of aquatic animals, as enzyme activity, resulting in these organisms consuming more food in a shorter time than if their environment were not changed.
● Mixing of nutrients and oxygen in between water layers is very much dependent on water temperatures.
● The high temperature at the top layer prevents proper mixing of water. Hence statement 2 is correct.
● This can lead to increased bacteria levels when there is ample food supply.
● Many aquatic species will fail to reproduce at elevated temperatures