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  4. The most numerous and ancient, smallest and simplest microscopic organisms belong to which of the following kingdom?

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Q. The most numerous and ancient, smallest and simplest microscopic organisms belong to which of the following kingdom?

AMUAMU 1999

Solution:

: The kingdom monera includes all prokaryotes (simplest, microscopic) - mycoplasma (smallest organism), bacteria (archaebacteria- ancient and primitive forms and eubacteria - true bacteria), actinomycetes (mycelial) and cyanobacteria. Progenote is considered to be an ancient form from which bacteria are evolved. Monerans are ubiquitous (i.e., present everywhere).