Question Detail
Question
What distinguishes a defined medium from an undefined medium?
Correct Answer
Option A is the correct answer.
Detailed Explanation
A defined (or synthetic) medium is one in which the exact chemical composition and precise quantity of every ingredient are known. Undefined (or complex) media, in contrast, contain components like extracts or peptones whose exact chemical makeup is not fully known.
Hint
The name itself gives a clue about the precision of the medium's composition.