Aquatic Ecosystems Quiz

What determines the types of fish and plants that can live in a lake?

• The temperature of the water

• The amount of dissolved salts the water contains

• The depth of the water

• The amount of sunlight available

During a marine biology expedition, researchers are focusing on organisms that are not anchored to the ocean floor but move freely in the water column. These organisms can be as tiny as microscopic algae or as large as a jellyfish. What term best describes these organisms?

• Plankton

• Benthos

• Nekton

• Wetland

During a marine biology expedition, researchers are studying organisms in a coastal ecosystem. What characteristic are they observing when they note organisms living attached to rocks or burrowing into the ocean floor sediments?

• Living attached to hard surfaces or burrowing into sediments

• Drifting in the water column

• Being microscopic algae

• Being the main food source for most aquatic ecosystems

What is a wetland?

• A type of plankton

• An area periodically under water

• A free-swimming organism

• A bottom-dwelling organism

Imagine visiting a beautiful lake surrounded by lush forests. As you walk closer to the shore, you notice an area teeming with fish, plants, and various forms of aquatic life. What is this nutrient-rich area near the shore called, known for its diverse and abundant aquatic life?

• Benthic zone

• Open water zone

• Littoral zone

• Limnetic zone

Imagine visiting a serene lake surrounded by a lush forest. In which zone of the lake would you find floating plants such as water lilies and rooted plants like cattails and reeds?

• Benthic zone

• Limnetic zone

• Littoral zone

• Aphotic zone

In which zone do phytoplankton make their own food by photosynthesis?

• Benthic zone

• Limnetic zone

• Littoral zone

• Aphotic zone

During a field trip, a group of students are studying ecosystems. They are particularly interested in the zone at the bottom of a pond, where they find decomposers, insect larvae, and clams. What is the name of this zone?

• Littoral zone

• Limnetic zone

• Benthic zone

• Aphotic zone

How do water beetles adapt to survive in lakes and ponds?

• They use barbels to catch fish as they swim over lake bottoms.

• They use the hairs under their bodies to trap surface air for breathing during dives.

• They burrow into the mud to hibernate.

• They photosynthesize like phytoplankton.

Imagine a lake near a heavily fertilized agricultural field. What happens to the lake due to runoff from the field, in the context of aquatic ecosystems?

• The process by which lakes become naturally devoid of oxygen over time

• The increase in the amount of nutrients, leading to large amounts of algae and plant growth

• The introduction of pollutants into a lake by runoff

• The natural filtration process of wetlands