Holt Environmental Science Aquatic Ecosystems

Which of the following is not a factor in determining where an organism lives in an aquatic ecosystem

• distance
• temperature
• sunlight 
• oxygen 

The zone that exists in shallow; sunlit water

• tropical
• littoral
• benthic
• eutrophic

Which of the following describes a function of a wetland

• Trap and filter pollutants
• add nutrients
• reduce flooding
• controls sunlight

Where are swamps usually found?

• flat, poorly drained area near streams
• in nonwoody areas
• away from streams
• In sloped areas with few plants

Why estuaries very productive ecosystems? 

• they constantly receive nutrients
• they have a large biodiversity
• they are close to the shore
• they absorb excess water

This ecosystem is dominated by grasses

• wetlands
• Bogs
• Mangroves
• marshes

Which of the following is a threat to coral reefs?

• Salinity 
• Runoffs
• Temperature
• Dams

Increase in nutrients

• Salinity
• runoffs
• eutrophication

Which of the following is a threat to ocean organisms?

• lack of nutrients
• climate change
• nets
• silt

What determines the arrangement of organisms in the ocean? 

• nutrients and salinity 
• sunlight and nutrients
• salinity and sunlight
• oxygen and salinity