Which one of the following should contain maximum DO?ans.Lakemolten glacier and ice capsGround waterRiverThis Question Is Marked For Review Previous Remove From Review Next

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

1. Lake
2. Molten glacier and ice caps
3. Ground water
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's a step-by-step analysis:

1. Lake: Lakes, especially those that are stagnant, may have lower levels of DO due to less movement and therefore less aeration.

2. Molten glacier and ice caps: Cold water can hold more dissolved oxygen than warm water. So, glacier meltwater can have high levels of DO.

3. Ground water: Groundwater typically has less DO because it is not exposed to the atmosphere and therefore has less opportunity to become aerated.

4. River: Rivers often have high levels of DO due to the movement and turbulence of the water which promotes aeration.

So, in general, the molten glacier and ice caps should contain the maximum DO because cold water can hold more dissolved oxygen than warm water. However, this can vary depending on other factors such as the presence of organisms, temperature, salinity, pressure, and pollution.