Question

Which characteristic best explains why algae blooms are more likely to grow out of control in lakes instead of rivers?

More photosynthetic organisms are found in lakes than in rivers.
Lakes have lower nutrient and dissolved oxygen levels than rivers.
Rivers have higher turbidity, which is preferred by photosynthetic organisms.
Lakes consist of still water where photosynthetic organisms can grow undisturbed.

Answer 1

The correct answer as to the characteristics the best explains why algae blooms are more likely to grow out of control in lakes than in rivers is that lakes consist of still water where photosynthetic organisms can grow undisturbed.

• A lake is a body of still water whereas a river consist of flowing water.
• When a lake becomes enriched, the nutrients is available all round for plants to pick up and photosynthesis can proceed without any disturbance due to flowing of water.
• Unlike lakes, the flowing river causes variability in the amount of nutrients available for plants that grow in them. The flowing can also cause some plants to get displaced. Thus photosynthetic process is disturbed.

The stability of of plants and photosynthetic process in lakes provide a ground for excessive thriving of plants during enrichment, unlike in flowing rivers.

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