Correct Answer - Option 3 : Timber dam
Concept:
Beaver dam: It is a dam built by beavers to give protection to the pond against predators such as wolves, bears etc and to provide easy access to food during winter. This dam is also known as beaver impoundments. Beaver species use the timber to make a barrier in pond with the help of mud and stone.
There are many benefits of the beaver dam like
- It help in flood control
- It help in excess nutrients removal from water
- It help in removal of pesticides and herbicide from water
- It helps in denitrification of water.
