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8.Microbes in Human Welfare
medium
Which of the following is used as biofertiliser?
$I.$ Cyanobacteria
$II.$ Yeast
$III.$ Symbiotic bacteria
$IV.$ Free living bacteria
Choose the correct option
A
$I, II$ and $III$
B
$I, III$ and $IV$
C
$II, III$ and $IV$
D
$I, II$ and $IV$
Solution
Cyanobacteria or blue-green algae is the most suitable source of biofertiliser; particularly in rice fields, $e.g.,$ Nostoc, Anabaena
Rhizobium is a symbiotic bacterium that lives in the root nodules of legumes and fixes atmospheric nitrogen into organic compound
Azospirillumand Azotobacterare free-living bacteria which absorb free nitrogen from soil, air and convert it into salts of nitrogen like amino acids and enrich soil nutrients
Standard 12
Biology
