Discussion
The solidifying agent commonly used in preparation of media is/are
Answer: C
Correct answer: both (a) and (b)
Agar is the usual solidifying agent, and silica gel is used where agar cannot be - for autotrophs that would metabolise any organic material, since silica gel is entirely inorganic. Gelatin was used historically but melts at incubation temperature and is digested by many bacteria.
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