Aquatic Organisms

1.  The chemistry of aquatic ecosystems is determined by

• amount of salts, nutrients, and oxygen dissolved in the water.
• number of other organisms present in the water.
• amount of rainfall the water receives.
• a.       biotic and abiotic factors in the water.

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Aquatic ecosystems are classified by all of the following EXCEPT

• Depth and flow of water
• Organisms that live there
• Temperature of the water
• Chemistry of the water

Which of the following is NOT an abiotic factor?

• salinity

• temperature

• dissolved nutrients

• fish

In what zone does photosynthesis take place?

• photic zone

• aphotic zone

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Salinity is a measure of

• dissolved nutrients

• pH

• salt concentration

• temperature

The bottom region of oceans and bodies of fresh water is 

• Benthos
• Benthic Zone
• Limnetic Zone
• Nekton

Two factors that determine where an organism lives in aquatic ecosystem are 

• Temperature and sunlight
• Neighbors and housing prices
• Fish and wildlife
• Darkness and tree height

Select all of the Abiotic factors below

• water temperature

• all the plants in the ecosystem

• salinity (salt level)

• amount of light

• pH levels

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Coastal upwelling zones are home to numerous species because the water coming off the bottom of the ocean is.....

• oxygen rich

• nutrient rich

• warmer than the surface water

• less dense than the surface water

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Which physical factors MOST influence a marine biome?

• tides, oxygen, coastal hotel development

• sunlight, fishing boats, whale population

• wave motion, salinity, atmospheric pressure

• plankton, water temperature, sand composition

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