Trichocyst - A stinging or grasping organ in the outer cytoplasm of certain protozoans, especially ciliates.

These are the ancient bacteria that can produce methane gas used in biogas plants.

In the five kingdom classification of Whittaker, there is no mention of these acellular organisms.

Pseudopodia means false feet that are seen in protozoa.

A bacterium with numerous flagella all around is peritrichous.

Lysergic acid diethylamide (LSD) is obtained from this fungi.

One of the distinctive characteristics of most bacteria and other prokaryotes is a unique cell wall. The only bacterium that has no cell wall is mycoplasma.

It is an obligate aerobe.

 Acellular protists are both Plasmodium and Monocystis.

Whittaker (1969) gave the 'five kingdom classification' based on which he classified living organisms in five groups: Monera, Protista, Fungi, Plantae and Animalia.

 Hard covering of amoeba is known as cyst. It acts as a protective shield to overcome adverse circumstances.

Monera is the single kingdom which can include blue-green algae, nitrogen-fixing bacteria and methanogenic archaebacteria.

Ammonifying bacteria release ammonia in the soil by decay and putrefaction. Nitrogen fixing bacteria can be symbiotic or non-symbiotic. Mycoderma aceti converts sugar solution to acetic acid.

It is supposed to be formed by the fusion of many zoospores. Hence, it consists of many nuclei and flagella. It is called synzoospore.

Root inducing plasmid which induces profuse rooting in infected plants.

 Two kingdoms constantly figured in all biological classifications are Plantae and Animalia.

The class basidiomycetes includes those members that produce their basidia and basidiospores on or in a basidiocarp.

Mycoplasmas are the organisms that completely lack cell wall. They are the smallest living cells known and can survive without oxygen.

Copeland (1938) included Monera (Mychota) in his classification (four kingdom) for the first time.

They are unicellular, colonial or filamentous, marine or terrestrial algae.