Select the correct combinations or statements about characteristics of certain organisms. a Methanogens are archaebacteria which produce methane in marshy areas. b Nostoc is a filamentous green algae which fixes atmospheric nitrogen. c Chemosynthetic autotrophic bacteria synthesize cellulose from glucose. d Mycoplasma lacks a cell wall and pathogenic to plant as well as animal.

Step-by-step solution

Archaebacteria belong to Kingdom Monera, includes methanogens, halophiles, and thermoacidophils. Nostoc is a cyanobacterium (Blue-green algae) which fixes atmospheric nitrogen. Mycoplasma lacks a cell wall and are known to infect both plants and animals. Chemosynthetic autotrophs oxidize inorganic substances to produce energy and help the cycling of minerals.