Question

Agricultural runoff can carry fertilizers into lakes and streams. This runoff can cause algae populations
to increase. Which effect does this change in the algae population sizes most likely have on affected
lakes and streams?
A.)an increase in water level
B.) an increase in water clarity
C.) a reduction in dissolved oxygen needed by fish and shellfish
D.) a reduction in temperature variations near the water's surface

Answer 1

Answer:

C

Explanation:

Answer 2

Agricultural runoff can carry fertilizers into lakes and streams. This runoff can cause algae population to increase.

These algae population reduces dissolved oxygen needed by fish and shellfish in lakes and streams.

How overgrowth of algae population can affect aquatic life?

Fertilizers are great source of phosphorous and nitrogen which can cause overgrowth of algae.

Over population of algae can cover the surface of the water bodies and prevent penetration of sunlight to the underwater plant.

Algae consume oxygen during night and produces oxygen only during day ( during photosynthesis).

When algae dies, it consumes oxygen.

Hence overall algae reduces dissolved oxygen level need by aquatic life to survive.

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