Class 12 NEET Biology Microbes in Human Welfare

Spirulina belongs to cyanobacterium that can be consumed by human beings and other animals. In dried form, it contains about 60% (51–71%) protein which includes all essential amino acids. Other nutrients that are found in rich quantities in Spirulina are vitamin b- thiamine and riboflavin, dietary minerals- iron and manganese. Methylophilus methylotrophus belongs to the group Methylotrophs which includes both Gram-negative and Gram-positive genera. Methylophilus methylotrophus, a bacterium can produce 25 tons of proteins. Button mushrooms provide 22 kilo calories of food energy and are an excellent source for Vitamins B, riboflavin and niacin as well as dietary minerals and phosphorous. Thus, the correct answer is option D.