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 Biology :

Drug resistance  Neuroglial Cells

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


(210 MB)


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


(133 MB)

 Physics :



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


(383 MB)



 Chemistry :


Destructive distillation of coal 

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


(203 MB)