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

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

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

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 is a step-by-step analysis of each option:

1. Ground water: Ground water is usually low in DO because it is not exposed to the atmosphere and therefore, has less opportunity to absorb oxygen.

2. Lake: The DO levels in lakes can vary. Surface water that is exposed to the atmosphere will typically have higher DO levels. However, deeper water, especially in stratified lakes, can have lower DO levels due to decomposition processes that consume oxygen.

3. Molten glacier and ice caps: Glacial meltwater can have high levels of DO because it is often cold (cold water can hold more DO than warm water) and because it is turbulent, which helps to mix in atmospheric oxygen.

4. River: Rivers often have high levels of DO due to their turbulence and contact with the atmosphere. However, this can vary depending on factors such as temperature, pollution levels, and biological activity.

Based on this analysis, molten glacier and ice caps should contain the maximum DO due to their cold temperatures and turbulence. However, this can vary depending on specific conditions.