Exam 24: Aquatic Ecosystems

The oxygen-minimum layer of an ocean occurs in the

Oxygen concentrations are relatively high in the bottom ooze of lakes and ponds.

What is the main form of photosynthetic life in the limnetic zone?

Which of the following lakes is likely to be the most oligotrophic?

Based on the taxa in the picture,which type of habitat is this?

Which type of lake has the largest amount of nutrients?

________ fish are those that live most of their lives in marine environments and return to freshwater to spawn.

Organisms living in deep-sea hydrothermal vents do not need light to obtain their energy.

Streams are classified according to orders.If two first-order streams join,flow through a valley,and are joined by another first-order stream,what is the final stream order?

Eutrophic lakes are typically clear,with little algal growth.

The velocity of water in a stream channel is greater along the margins of the channel than in the center of the channel.

Many zooplankton migrate to the surface to graze on phytoplankton during the day and retreat to deeper water during the night.

Lakes can be formed from both geological and nongeological activity.

The tiny,photosynthetic,primary producers of open water such as desmids,diatoms,and filamentous algae are referred to as ________.

The productivity of oceans is greatest in the

The zone in the ocean from the surface to approximately 200 meters deep is called the ________ zone.

The dominant autotrophs of the open water are

In lakes and ponds,photosynthesis occurs primarily in the

Streams generally have a(n)________ temperature at their headwaters than toward their outlet.

In lakes and ponds,the ________ zone is a shallow-water zone along the perimeter in which light reaches the bottom.