NEET BIOLOGY

Detailed explanation-1: -Explanation of correct option: Oceans are a reservoir of all water sources. The water of oceans is mostly saline and is unfit to use. Water from rivers, and lakes all reach oceans and hence it is not fresh.

Detailed explanation-2: -Freshwater habitats include ponds, lakes, rivers, and streams, while marine habitats include the ocean and salty seas.

Detailed explanation-3: -Wetlands are not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations-these support different species of animals, such as shrimp, shellfish, and various grasses.

Detailed explanation-4: -Glaciers, rivers and wells are sources of freshwater. Oceans and seas are sources of saline water and not freshwater.

Detailed explanation-5: -The freshwater ecosystem is mainly divided into three types based on its region – Lotic, lentic, and wetland freshwater ecosystem.