Pools, Ponds, and Lakes Answers

An increase in the number of phytoplankton in an aquatic ecosystem is always beneficial.

What important function do stream pools serve?a.Stream pools serve as a habitat for juvenile fish.b.Stream pools serve as a habitat for organisms that have difficulty in feeding or navigating swifter areas of the stream.c.They have greater depth and lower velocity than other parts of the stream, thus allowing a habitat for organisms during dryer seasons.d.All of the above

Eutrophication is caused by _______.a.an increase in nutrientsb.a decrease in nutrientsc.the introduction of new species of animalsd.the introduction of new species of plants

How are littoral and riparian zones different?a.Littoral zones contain vegetation, while riparian zones do not.b.Littoral zones have greater access to sunlight than riparian zones.c.Riparian zones are more important to aquatic animals than littoral zones.d.Riparian zones occur where water meets land, while littoral zones occur at depths of less than 15 feet.

Plankton are most commonly found in the _______.a.pelagic zoneb.littoral zonec.benthic zoned.all of the above

Riparian zones are important to the natural environment because they _______.a.contain pollution from runoffb.reduce soil erosionc.support diverse organismsd.all of the above

Most aquatic plant life can be found in the littoral zone.

Littoral zones are more likely to contain vegetation than riparian zones.

Why are living organisms more common in the littoral zone than in the benthic zone?a.The benthic zone has less light penetration.b.The littoral zone has a variety of plants.c.The littoral zone provides more resources.d.All of the above

Which of the following statements about eutrophication is true?a.Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent increase in the oxygen levels of the water.b.Eutrophication occurs when excess nutrients are present in aquatic ecosystems, resulting in the increased production of plant life and the subsequent decrease in the oxygen levels of the water.c.Eutrophication involves the overpopulation of aquatic ecosystems with plant and animal life.d.Eutrophication is rarely caused by human activity.