Which is known as 'Terror of Bengal' ?

Water hyacinth

Water hyacinth (Eichhornia crassipes) is called the 'Terror of Bengal'.

It is also known as the terror of Bengal because it is an exotic shrub which is growing at an alarming rate on the surface of water body. It inhibits the grow of fish and other aquatic organisms due to cut down of light and lack of oxygen. It depleted the dissolved oxygen in the water bodies leading to large scale loss of aquatic life, particularly fishes.

It is also competing with the other native species and has also eliminated many. It is an example of loss of biodiversity due to alien species invasion.