Microbiology of Soils
Which of the following statement is not true about composition of biogas?

Both (a) and (b)
It also contains with traces of O2 and Cl2
It also contains with traces of H2S, N2, H2and CO
It is composed almost exclusively of methane and carbon dioxide

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Microbiology of Soils
A heterocyst is

the progenitor of cyanobacterial vegetative cells
a terminally differentiated cell that fixes nitrogen
a type of spore
a cell that carries out oxygenic photosynthesis

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Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix nitrogen

these bacteria are from the genus, Rhizobium
All of these
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen

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