Explain in detail about-"Mental Health and Adolescence".

Define-Adolescence.

Define Health.

Explain in detail radioactive pollution.

Explain in detail the ecological hierarchy .

Explain in detail three classes of algae.

Answer the following : Explain in detail about the electric bell with the help of a diagram .

Explain in detail the advantages of hydroelectric power generation and problems associated with hydroelectric power plant.

Explain in detail the laws enacted about environmental conservation.

Explain in detail exponential growth curve of population .

Explain in detail how biotechnology can be useful in agriculture.