Which one of the following should contain maximum DO?ans.Ground waterRiverLakemolten glacier and ice caps Previous Marked for Review Next

The question seems to be asking which of the following should contain the maximum Dissolved Oxygen (DO):

1. Ground water
2. River
3. Lake
4. Molten glacier and ice caps

Dissolved Oxygen (DO) is the amount of oxygen that is present in water. It is an important measure of water quality as it indicates a water body's ability to support aquatic life.

Here's a step-by-step analysis:

1. Groundwater: Groundwater is usually low in DO because it is isolated from the atmosphere, which is a major source of oxygen.

2. River: Rivers often have moderate levels of DO because they are exposed to the atmosphere and often contain photosynthesizing plants and algae. However, the level can vary depending on temperature, salinity, and pressure.

3. Lake: Similar to rivers, lakes can have moderate levels of DO. However, because lakes are often stratified, the DO levels can vary greatly from top (epilimnion) to bottom (hypolimnion).

4. Molten glacier and ice caps: Glacial meltwater can have high levels of DO because the process of melting under high pressure can trap a lot of oxygen. Also, cold water can hold more DO than warm water.

So, out of the options given, molten glacier and ice caps should contain the maximum DO.