ES 121 Ocean Water and Life

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A. Salinity

The total amount of solid material dissolved in water is known as _____.
A. Salinity
B. Solute
C. Insoluble Residue
D. Load

D. Thermocline

A rapid change in temperature with depth in the ocean is called the _____.
A. Pynocline
B. Homocline
C. Isocline
D. Thermocline
E. Barocline

A. Pynocline

A rapid change in density with depth in the ocean is called the _____.
A. Pynocline
B. Thermocline
C. Isocline
D. Barocline
E. Homocline

D. All of these

Productivity in temperature oceans is determined by _____.
A. Latitude
B. Ocean Currents
C. Seasons
D. All of these

Outgassing

The emission of water vapor and other gasses from volcanoes is called _____.

Thermocline

_____ refers to the change in temperature with depth in the ocean.

Density

The pynocline is a rapid change in _____ with depth in the ocean.

Plankton

_____ include all organisms that drift with ocean currents.

Biomass

_____ refers to the mass of all living organisms on Earth.

Zooplankton

Among plankton, animals that drift on ocean currents are specifically known as _____.

Benthos

Clams, sponges, and crabs are all examples of _____ organisms.

B. trophic

In the food chain, each feeding stage is called a _____ level.
A. replenishment
B. trophic
C. bios
D. none of these

SKIP

Choose the option which does not fit the pattern
A. sodium chloride
B. magnesium chloride
C. sodium sulfate
D. carbon dioxide

C. neritic

Choose the option which does not fit the pattern
A. plankton
B. nekton
C. neritic
D. benthos

A, photic zone

Choose the option which does not fit the pattern
A. photic zone
B. intertidal zone
C. neritic zone
D. oceanic zone

C. both A and B

Density in seawater is determined by _____.
A. Salinity
B. Temperature
C. Both A and B
D. none of these

D. all of these

Most marine animals live near the surface of the ocean because of _____, which supports photosynthesis by marine algae that form the basis of the food chain.
A. sunlight
B. warmer temperatures
C. air
D. all of these

A. plankton

Organisms, such as algae and bacteria, that drift with ocean currents are known as _____.
A. plankton
B. biomass
C. benthos organisms
D. nekton
E. none of these

A. biomass

The mass of all living organisms on Earth is called the _____.
A. biomass
B. nekton
C. plankton
D. benthos organisms

D. phytoplankton

Technically, algae are called _____.
A. bioplankton
B. zooplankton
C. nektoplankton
D. phytoplankton

C. nekton

Animals capable of moving independently of the ocean currents, by swimming or other means of propulsion, are called _____.
A. plankton
B. biomass
C. nekton
D. benthos organisms

C. Benthos

_____organisms live on or in the ocean bottom.
A. nektonic
B. scavenging
C. benthos
D. planktonic
E. none of these

A. Photic

The upper part of the ocean into which sunlight penetrates is called the _____ zone.
A. photic
B. life
C. mixing
D. thermal

D. euphotic

The _____ zone is the near-surface zone of the ocean where light is strong enough for photosynthesis to occur.
A. aphotic
B. intertidal zone
C. neritic
D. none of these

B. neritic

Seaward of the low tide line is called the _____ zone.
A. oceanic
B. neritic
C. intertidal
D. none of these

SKIP

Open ocean of any depth where animals swim or float freely is known as the _____ zone.
A. pelagic
B. unrestricted
C. benthic
D. abyssal

B. intertidal zone

The area where the land and ocean meet and overlap is called the _____ zone.
A. oceanic
B. intertidal zone
C. neritic
D. none of these

A. primary productivity

The amount of carbon fixed by organisms through the synthesis of organic matter using energy derived from solar radiation is called _____.
A. primary productivity
B. photosynthesis
C. chemosynthesis
D. none of these

A. lower latitudes

Thermoclines in the ocean are best developed at _____.
A. lower latitudes
B. both high and low latitudes
C. regions close to continents
D. higher latitudes

SKIP

The proportion of dissolved substances in seawater is expressed as 0/00 which is the same as _____.
A. parts per hundred
B. parts per million
C. parts per thousand

SKIP

The most abundant salt in seawater is _____.
A. NaCl
B. KCl
C. MgCl2
D. none of these

A. outgassing of elements from Earth's interior

The dissolved materials in seawater are thought to originate from chemical weathering of rocks on the continents and also from _____.
A. outgassing of elements from Earth's interior
B. organisms
C. evaporation of fresh water
D. erosion
E. none of these

C. evaporation; precipitation

Salinity in the ocean is highest in regions where _____ is high and _____ is low.
A. precipitation; evaporation
B. precipitation; temperature
C. evaporation; precipitation
D. temperature; evaporation

B. cold, nutrient-rich water from the ocean depths to the surface

An ocean upwelling carries
A. warm water from the central ocean toward the coasts.
B. cold, nutrient-rich water from the ocean depths to the surface
C. warm water from the ocean depths to the surface
D. nutrients down to the deep ocean

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