Question

Select the correct combination of the statement (1-4) regarding the characteristics of certain organisms.
(1) Methanogens are Archaebacteria, which produce methane in marshy areas.
(2) Nostoc is a filamentous blue-green alga, which fixes atmospheric nitrogen.
(3) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
(4) Mycoplasma lacks a cell wall and can survive without oxygen.
The correct statements are

• A. (2) and (3)
• B. (1), (2) and (3)
• C. (2), (3) and (4)
• D. (1), (2) and (4)

Answer 1

The correct option is D (1), (2) and (4)

Methanogens are microorganisms that produce methane as a metabolic byproduct in anoxic conditions. They are classified as Archaea, a domain distinct from bacteria. They are common in wetlands, where they are responsible for marsh gas. Cyanobacteria are often called as blue-green algae. Cyanobacteria are a photosynthetic nitrogen fixing group that survive in wide variety of habitats, soils, and water. Mycoplasma refers to a genus of bacteria that lack a cell wall. Mycoplasma can survive without oxygen.