SSC MTS EXAM

Detailed explanation-1: -The anomalous expansion of water helps preserve aquatic life during very cold weather. When temperature falls, the top layer of water in a pond contracts, becomes denser and sinks to the bottom. A circulation is thus set up until the entire water in the pond reaches its maximum density at 4°C.

Detailed explanation-2: -Water is unique, however, because its solid state (ice) is actually less dense than its liquid phase, allowing walleye and other aquatic life the ability to survive underneath the ice in cold, but unfrozen waters each winter.

Detailed explanation-3: -They are generally less active and more sluggish, making them susceptible to predators. Additionally, the cold water can damage their gills, making it difficult for them to breathe. As the ice starts to form on the surface of the water, it also blocks out sunlight, which can affect the growth of aquatic plants.