Question

Select the correct combination of the statements(a-d) regarding the characteristics of certain organisms : (i) Methanogens are archaebacteria which produce methane in marshy area (ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen (iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose (iv) Mycoplasma lack a cell wall and can survive without oxygen. The correct statements are :

• A. (ii) & (iii)
• B. (i),(ii) & (iii)
• C. (ii), (iii) & (iv)
• D. (i), (ii) & (iv)

Answer 1

Answer: (D)

(i), (ii) & (iv)

Answer 2

Chemosynthetic autotrophic bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. They play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.