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Match column I with column II and choose the correct option.
Column IColumn II
A. Mycoplasma(i) Nitrogen fixing cells
B. Decomposers(ii) Blue green algae
C. Methanogens(iii) Production of methane
D. Heterocysts(iv) Most abundant heterotrophs
E. Cyanobacteria(v) Pathogenic in plants and animals

A. A-(i) B-(ii) C-(iii) D-(iv) E-(v)

B. A-(iii) B-(v) C-(ii) D-(iv) E-(i)

C. A-(iii) B-(i) C-(v) D-(ii) E-(iv)

D. A-(v) B-(iv) C-(iii) D-(i) E-(ii)

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Correct Answer : D.


Mycoplasma are those organisms which completely lack a cell wall and survive without oxygen. They are pathogenic in plants and animals. Decomposers are the most abundant heterotrophs. They break down dead or decaying organisms and carry out the natural process of decomposition. Methanogens produces methane as a byproduct. Heterocysts are capable of nitrogen fixation and therefore play a major part in the nitrogen cycle. Cyanobacteria are blue green algae.

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