Exam 12: The Plankton, Productivity, and Food Webs

Archaea are found only in physically extreme environments such as hydrothermal vents.

During a dark-light bottle experiment, the light bottle yielded a change of +10 in arbitrary units of oxygen change, while the dark bottle yielded a change of -2. What is the rate of gross photosynthesis?

The difference between food webs and food chains is that food webs ________.

Cyanobacteria such as Trichodesmium play an important role in the oceans because they fix nitrogen gas.

DOM or dissolved organic matter is largely unused by other organisms.

The arctic region has low annual productivity because ________.

Which is not a member of the zooplankton?

In the dark-light bottle experiment, which one of the following is measured in the dark bottle?

Phytoplankton use all of the following as part of the cell structure except ________.

If both primary productivity and grazing are large, the standing stock cannot be small.

A high-oxygen content and a low-nutrient content in surface seawater indicate that a population of ________ are present.

Greater mixing and nutrients from the land cause the coastal areas to generally have higher primary productivity than the open ocean.

The plankton, benthos, and nekton are subdivisions of the ________.

As organic material sinks through the ocean, much of it is remineralized by ________.

A standing crop of phytoplankton can be measure by ________.

Krill is the common name for copepods.

Red tides may or may not be poisonous to other marine organisms.

At temperate latitudes, a stable water column with a pycnocline near the surface will ________ primary production in the spring and ________ primary production in late summer.

Some planktonic cyanobacteria have the ability to "fix" which of the following elements, thus having a fertilizing effect on the marine environment similar to the ability of the land plants legumes?

The standing stock of a population is equivalent to its biomass.