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AP® Environmental Science

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Source of Pollution

APES-9QUKA4

Homeowners are concerned about the recent mass deaths of aquatic life such as minnows, walleyes, perch and trout in the pond that their properties surround. The mass deaths typically occur shortly after the pond experiences an algal bloom.

Which of the following is the best explanation for the rapid decrease in aquatic life?

A

The runoff of herbicide used on the nearby golf course is causing the algae bloom and subsequent die-off.

B

The photosynthetic algal bloom is consuming all of the oxygen in the pond causing the fish to suffocate.

C

After the algal bloom reaches carrying capacity decomposers rapidly consume all of the oxygen in the pond.

D

The thermal pollution due to the lack of shade around the pond is increasing photosynthetic activity as well as increasing dissolved oxygen levels.

E

The fertilizer runoff is absorbing oxygen in the pond causing the aquatic organisms to suffocate.