Introduction to Aqautic Ecosystems Article

What is a lotic system?

• A system of still water bodies like lakes and ponds

• A system of flowing inland bodies like rivers and streams

• A system of underground water bodies

• A system of oceanic water bodies

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Which of the following is NOT a characteristic of a river at its source?

• Narrower in size

• Cold and fast-flowing

• Rich in oxygen

• Wide in size

How does the oxygen content change from the source to the end of a river in a lotic system?

• Increases

• Decreases

• Remains the same

• Fluctuates

What factor does NOT affect lifeforms in a lotic system?

• Nature of the flowing water

• Behavior of the flowing water

• Color of the water

• Temperature of the water

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Which of the following best describes the physical change of a river from source to end?

• Narrower to wider, colder to warmer, faster to slower

• Wider to narrower, warmer to colder, slower to faster

• Narrower to wider, warmer to colder, slower to faster

• Wider to narrower, colder to warmer, faster to slower

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What are the three zones where living activities occur in aquatic ecosystems?

• Surface, middle, bottom

• Top, center, base

• Upper, central, lower

• Shallow, deep, deepest

What are the scientific names for life forms in water?

• Plankton, Nekton, Benthos

• Phytoplankton, Zooplankton, Nekton

• Algae, Fish, Crustaceans

• Producers, Consumers, Decomposers

What is the primary role of phytoplankton in aquatic ecosystems?

• Primary producers

• Primary consumers

• Decomposers

• Secondary consumers

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Which of the following is an example of zooplankton?

• Larvae of fish

• Green algae

• Diatoms

• Seaweed

What can an excessive bloom of plankton cause in a water body?

• Block sunlight and harm other lifeforms

• Increase oxygen levels

• Enhance water clarity

• Promote fish growth

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