Especie indicadora

The video explains how certain aquatic organisms can indicate water quality. Dragonfly larvae are sensitive to pollutants, so their presence suggests low pollution levels. In contrast, Tubifex worms can survive in highly contaminated water, indicating poor water conditions.

What does the presence of dragonfly larvae in a water body suggest?

• Presence of Tubifex worms

• Low levels of water pollution

• High levels of oxygen

• High levels of water pollution

Which of the following is sensitive to pollutants in water?

• Algae

• Snails

• Dragonfly larvae

• Tubifex worms

What does the presence of dragonfly larvae NOT indicate?

• High pollution levels

• Clean water

• Low pollution levels

• Healthy aquatic life

Which organism can tolerate higher levels of water contamination?

• Frogs

• Tubifex worms

• Dragonfly larvae

• Fish

What is indicated by the presence of Tubifex worms in a stream?

• Poor water conditions

• High water temperature

• Good water quality

• Abundance of fish