Abstract
Diatoms are unicellular, autotrophic (photosynthetic) alga that has most distinctive features of crystalline extra cellular coat or frustules composed of silica and having unique patterns of symmetry and micro structure. They are found almost in aquatic environment including fresh and marine waters, soils, in fact anywhere in moist environment. For the identification and examination of diatom, total 40 water sample were collected from 10 different sites of Ganga River at Varanasi and Allahabad. After the analysis it was found that 22 diatom genera were recognised, in which 2 diatoms Actinocyclus sp., Triblionella sp. were peculiar in Varanasi and 1 diatom Cyclotella sp. was peculiar on Allahabad, 19 common species were identified in Varanasi and Allahabad. After analysis it's found that the population growths vary in winter and summer season at both places.
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