HSC Investigating Science Practice Questions - HSC Investigating Science (NSW Higher School Certificate, Year 12) Exam

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Alexander Fleming observed a clear zone free of bacterial growth surrounding a Penicillium mold contaminant on a Staphylococcus agar plate. What cause-and-effect deduction did he make?

The mold produced a diffusible chemical substance that inhibited or killed nearby bacteria The bacteria consumed the mold, leaving a clear zone of dead fungal cells High room temperature caused the bacteria to undergo spontaneous lysis near agar edges The agar gel lacked nutrients near the mold colonies

Correct Answer:

The mold produced a diffusible chemical substance that inhibited or killed nearby bacteria

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