MONERA (blue green algae, mycoplasma) Flashcards
Blue green algae are also called?
Cyanobacteria.
Information of blue green algae.
1)Found in freshwater, marine water, and terrestrial habitat.
2)First Organism that produce oxygen on earth.
3)They are photosynthetic prokaryotic.
4)These bacterias are not always blue green colour.
What causes the red colour of Red Sea?
**Trichodesmium ** is a red coloured alga
What are the different forms of BGA?
1) unicellular.
ex: SPIRULINA It is the edible BGA because it has large amount of protein.
2) Colonial.
ex: ANABAENA
3) Filamentous.
ex: NOSTOC
What is the structure of BGA?
1) it is similar to Gram(-) eubacteria.
2) Surrounded by mucilagenous sheath.
3) The cell wall is bylayered.
Outer layer- lipopolysaccharide.
Inner layer- peptidoglycan.
4) cell wall is made up of lipoproteins.
What are heterocytes?
Special cell for nitrogen fixation.
They are thick walled, non green cell, non photosynthetic cell.
Rhizobium
1)Present in root of legumes.
2)Nitrogen fixation can only occur when there is no oxygen present.
Nitrogen fixation.
1)Symbiotic.
ex: Azolla leaf
BJA Anabaena is present on leaf of azolla
2)Asymbiotic.
Reproduction of BGA
1) vegetative.
a) binary fission.
b) fragmentation.
2) Asexual.
Reproduction of BGA.
Vegetative Reproduction.
1) binary fission is the most common method.
2) Fragmentation by Hormocyst formation.
ex: Oscillatoria
Reproduction in BGA.
Asexual reproduction.
ex: Akinete formation in Nostoc
Water bloom?
1)Excessive growth of BGA in water, that pollutes the water.
2)The toxic substances that are produced are also known as death factor.
3)They are the main cause of death in aquatic animals.
Economic importance of BGA
Useful activities of BGA
1) used as green manure.
2) Secrets toxic, which inhabits the growth of mosquito larva in water.
Economic importance of BGA
Harmful activities of BGA
Mycoplasma.
Also called as PPLO (pleuro pheumonia like organism) or MLO ( mycoplasm like organism)
