Which one of the following should contain maximum DO?ans.Lakemolten glacier and ice capsGround waterRiver

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 usually have a moderate level of DO. The level can vary depending on temperature, as cold water can hold more oxygen than warm water. It can also vary depending on the amount of algae and phytoplankton present, as these organisms produce oxygen during photosynthesis.

2. Molten glacier and ice caps: Glacial meltwater and ice caps can have high levels of DO because they are often very cold (and cold water can hold more oxygen). However, they may not have as much DO as a fast-moving river.

3. Ground water: Groundwater usually has lower levels of DO because it is not exposed to the atmosphere and therefore has less opportunity to absorb oxygen. It also often contains organisms that consume oxygen, further reducing the DO level.

4. River: Rivers often have the highest levels of DO, especially if they are fast-moving. The movement of the water helps to mix in oxygen from the atmosphere. However, the level can vary depending on temperature and the presence of organisms that consume or produce oxygen.

So, in general, a river would typically contain the maximum Dissolved Oxygen (DO) among the options given. However, this can vary depending on specific conditions.