How has DDT caused decline in bird population?

Ornithologists observed decline in the bird population in an area near a lake after the setting of an industrial unit in the same area. Explain the cause responsible for the decline observed.

Create an aquatic food chain in a water body into which effluents flow from a pesticide factory. Diagrammatically represent biomagnification in this food chain Explain why a decline in the predator bird population is expected when its feeds on the tertiary consumer of this food chain.

What do you mean by declining population ?

What do you mean by declining population?

Explain biomagnification of DDT in an aquatic food chain. How does it affect the bird population?

List four causes of increase in human population ?