Botany - Biological Classification Question with Solution | TestHub

Bacteria (Greek word "bacterion" meaning small stick) belong to the kingdom Monera, they are microscopic organisms mostly ranging between 1-5$\mathrm{\mu }\mathrm{m}$. They are autotrophic as well as heterotrophic.

Autotrophic bacteria can derive their nutrition either through sunlight (photoautotrophic) or through certain chemicals (chemoautotrophic). Heterotrophic bacteria can derive their nutrition from decaying matter (decomposer) or they may take nutrition from host (parasitic). Bacteria show great diversity in their mode of nutrition.