State the characteristic features of Kingdom Monera. 

Explanation

Bacteria are the sole members of the Kingdom Monera.
Occurance: Bacteria are the most abundant microorganisms which occur almost everywhere.
Hundreds of bacteria are present in a handful of soil.
They also live in extreme habitats such as hot springs, deserts, snow and deep oceans where very few other life forms can survive.
Many of them live in or on other organism as parasites.
Types based on shape: Bacteria are grouped under four categories based on their shape.
The spherical coccus (Pl. Cocci), the rod shaped Bacillus (Pl. bacilli), the comma - shaped Vibrium (Pl. Vibrio) and the Spirillum (Pl. Spirilla).

Mode of nutrition : Though the bacterial structure is very simple they are very complex in behaviour.
Bacteria show the most extensive metabolic diversity.
Some of the bacteria are autotrophic i.e. they synthesise their own food from organic substrates.
They may be Photosynthetic autotrophic or chemosynthetic autotrophic.
The vast majority of bacteria are heterotrophs i.e. they do not synthesise their own food but depend on other organisms or on dead organic matter for food.