Give differences : $B-$ lymphocytes and $T-$ lymphocytes

The pathogens of genera, Microsporum, Trichophyton and Epidermophyton are responsible for

Which one of the following is a stimulant?

Which virus, for the first time, was synthesised in the form of non-living crystals

A cyst of Entamoeba histolytica produces trophozoites

Immunity is provided by