Question

compare point and nonpoint source pollution causes and effects on a watershed
which statements are true about point and nonpoint source pollution?

• human activity causes point and nonpoint source pollution.
• only nonpoint source pollution affects abiotic factors in a watershed.
• point source pollution affects only the part of the lake or river near it.
• both point and nonpoint source pollution affect biotic factors in a watershed.
• point pollution flows through the bodies of water in a watershed but not through its land.

Explanation:

1. Human activity causes point and nonpoint source pollution: Point sources (e.g., factory discharge pipes) and nonpoint sources (e.g., agricultural runoff from farms) are both driven by human activities. This is true.
2. Only nonpoint source pollution affects abiotic factors in a watershed: Both pollution types alter abiotic factors (e.g., point source chemical waste changes water pH; nonpoint runoff increases sedimentation). This is false.
3. Point source pollution affects only the part of the lake or river near it: Point source pollutants can spread via water currents across large areas of a watershed, not just the immediate vicinity. This is false.
4. Both point and nonpoint source pollution affect biotic factors in a watershed: Both can harm aquatic life (e.g., point source toxic waste kills fish; nonpoint fertilizer runoff causes algal blooms that deplete oxygen for organisms). This is true.
5. Point pollution flows through the bodies of water in a watershed but not through its land: Point source pollution can move over land before entering water bodies (e.g., a leaking pipe contaminating soil before reaching a river). This is false.

Answer:

• Human activity causes point and nonpoint source pollution.
• Both point and nonpoint source pollution affect biotic factors in a watershed.