| [a] Methanogens are Archaebacteria, which produce methane in marshy areas. |
| [b] Nostoc is a filamentous blue-green algae, which fixes atmospheric nitrogen. |
| [c] Chemosynthetic-, .autotrophic bacteria synthesize cellulose from glucose. |
| [d] Mycoplasma lack a cell wall and can survive without oxygen. |
A) B, C
B) A, B, C
C) B, C, D
D) A, B, D
Correct Answer: D
Solution :
Methanogens are archaebacteria, which produce methane in marshy areas. Nostoc is a blue-green alga, which fixes atmospheric nitrogen. Chemosynthetic autotrophs oxidize inorganic substances to produce energy and help in the cycling of minerals. Mycoplasmas are a group of eubacteria that lack a rigid cell wall and can survive without oxygen.
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