AALSO Water Quality Level 1 Practice Test

Which pictogram indicates acute toxicity?

Pictogram indicating acute toxicity Pictogram indicating environmental toxicity Pictogram indicating harmful irritant Pictogram indicating flammable

Correct Answer:

Pictogram indicating acute toxicity

Explanation:

Acute toxicity is signaled by the skull and crossbones pictogram. This symbol warns that a substance can cause severe health effects quickly after a single exposure—through swallowing, inhaling, or skin contact. It’s the marker used for substances that are highly toxic in the short term. The other symbols represent different hazards: the environmental toxicity pictogram (dead tree and fish) flags harm to the environment rather than immediate human toxicity; the exclamation mark pictogram covers irritants and some less-severe health hazards; the flame pictogram indicates flammability. So the skull and crossbones is the one that specifically indicates acute toxicity.

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