Biology :

Certain mutant bacterial strain resist the antibiotic effect. Such an effect is called drug resistance.

(210.60 MB)

The nervous system consists of neurons and neuroglial cells. Neuroglial cells are further classified into oligodendron, astrocyte and microglial cells.

(133.08 MB)

 Physics :

Study the formation of a convex lens and a concave lens, and their properties.

(294.32 MB)

 Chemistry :

On heating coal in the absence of air, it undergoes decomposition to give various components such as coalgas, coaltar, water gas and coke.

(208.86 MB)