Question

Select the correct combinations or statements about characteristics of certain organisms.
$\left(a\right)$ Methanogens are archaebacteria that produce methane in marshy areas.
$\left(b\right)$ Nostoc is a filamentous green alga that fixes atmospheric nitrogen.
$\left(c\right)$ Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
$\left(d\right)$ Mycoplasma lacks a cell wall and is pathogenic to plants as well as animals.

• A. a, b, c and d
• B. a, b and d
• C. c and d
• D. a and d

Answer 1

Answer: (D)

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.