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A bacteria that tested negative for starch hydrolysis still managed to grow a few colonies on...

A bacteria that tested negative for starch hydrolysis still managed to grow a few colonies on a TSA+Starch agar plate, even though it did not have the enzyme needed to breakdown starch. how is this possible?
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Some bacteria mutate themselves according to new environment (resistance in bacteria is best example of it) .As there is no other source of glucose for bacteria to grow on TSA +starch.So some bacteria which are capable of degrading starch ,survive on this media and all other which were not capable of degrading starch ,dies.

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