Aquatic Populations

Plankton are the primary producers of the ocean. Where would you find ​MOST of the plankton in the ocean?

• near the surface of the ocean

• along the seafloor of the ocean's coral reefs

• near the bottom of the ocean

• in the colder and polar regions of the ocean

The pH of a lake in Florida has decreased below 5.0 due to an increase in acid rain. Which of the following is MOST LIKELY to occur as a result of the pH change?

• increase of fish populations

• decrease of fish populations

• increase in the plankton populations

• decrease of water temperatures

How do ecologists classify aquatic ecosystems?

• Salinity

• Depth

• Movement

• All of the above

Salinity refers to

• how many plants are in the water

• how many organisms live in the water

• how much salt in is water

An area in which fresh water from a river mixes with salt water from the ocean

• Mangrove Swamp
• Estuary
• Marshes
• Wetland

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

Area in a body of water where it is cool and dark and bottom-feeders are located.

• Oceanic Photic Zone

• Benthic Zone

• Intertidal Zone

• Neritic Zone

What factors affect aquatic ecosystems? 

• Light, salinity, temperature
• Sun, moon and stars
• Nothing
• Coral reefs, whales

Why does photosynthesis not occur in the deep ocean? 

• Lack of nutrients
• Low oxygen levels
• Excess sunlight
• Sunlight does not penetrate

Which of the following are producers in the food web?

• Phytoplankton and seaweed

• Phytoplankton and zooplankton

• Squid and Elephant Seal

• Seaweed and Crabs