Which of the following is not archaebacteria?

1. Halophile
2. Thermoalkalophiles
3. Methanogens
4. Thermoacidophiles

Hot spring hosts which kind of archaebacteria?

1. Thermoacidophiles
2. Thermoalkalophiles
3. Thermophiles
4. Thermoneutrophiles

Which organisms are responsible for the production of  biogas?

1. Archaebacteria
2. Eubactetia
3. Mycoplasma
4. Protists

The characteristic feature of eubacteria is -

1. Rigid cell wall
2. Flagellum in motile ones
3. Chlorophyll a
4. all of these

Cyanobacteria do not possess which feature?

1. Unicellular
2. Colonial or filamentous
3. Form blooms in polluted water bodies
4. Only marine algae

The specialised cells to fix atmospheric nitrogen is called as

1. Heterocyst
2. Heterocyte
3. Heterocoem
4. Heterolog

Find the incorrect match.

1. Heterocyst-Archaebacteria
2. Gelatinous sheath- BGA
3. Methanogen- Biogas
4. Chlorella- protista

Which of the following is correct with respect to heterocyst

1. Nostoc, Anabena
2. Only Anabena
3. Nostoc
4. All eubactetia

Chemosynthetic autotrophic bacteria does not help in recycling of

1. Nitrogen
2. Iron
3. Sulphur
4. Mangnese 

Chemosynthetic bacteria does not use which inorganic substrate?

1. Nitrites
2. Nitrates
3. Chlorides
4. Both a and b