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Mulitple Choice Questions

Which one of the following is representing the group of diatoms?

    1. Euglenamorpha, Hedneria , Heteronema, Colacium
    2. Nostoc, Anabaena, Aulosira, Cylindrospermum
    3. Pinnularia, Navicula, Cymbella, Melosira
    4. Cochlodinium, Gymnodinium, Lenodinium, Peridinium