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

What are weeds ? How does it affect the yield of crop ?

How has DDT caused decline in bird population?

How does heavy rain affect us?

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.

Highest DDT concentration in a aquatic food chain shall occur in

Explain the cause of algal bloom in a water body. How does it affect an ecosystem?

Explain circumstances leading to acid rain . How does acid rain affect us ?