WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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Agricultural fertilizer runoff enters a freshwater lake, causing an algal bloom: Step 1: Rapid multiplication of surface algae. Step 2: Algae die and sink to the lake bottom. Step 3: Bacterial decomposers multiply rapidly and consume dead algae, using up dissolved oxygen. Step 4: Fish die from suffocation. What was the direct cause of fish mortality?

Fish ate poisonous fertilizer directly. Bacterial decomposers consumed dissolved oxygen while decomposing dead algae, causing severe oxygen depletion. Algae blocked fish from swimming. Water temperature froze.

Correct Answer:

Bacterial decomposers consumed dissolved oxygen while decomposing dead algae, causing severe oxygen depletion.

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