Question

why is it necessary to sterilize the roots of rhizobia in this experiment? A. to prevent the destruction of rhizobia B. to prevent the bacterial infection to Us C. to prevent the mixing of other bacteria with rhizobia D. none of these

Answer 1

As Rhizobium is known to survive a soil and in roots of legumes as well as non leguminous plants. Bacteria depends on root exudates which stimulate the growth of rhizobial cells. Therefore, Rhizobium secretes extracellular polysaccharides which helps to find soil particles.