Question

following are some statements related to mixed culture
a.       The same as a contained culture
b.      One that contains 5 species of microbes
c.       One that contains two species of microbes
d.      A pond sample containing algae and protozoa. Which of the following given statements/statement describe the qualities of mixed culture a

A a,b,c,d
B a,b,c
C a & c
D c & d
E b & c
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