Select all statements that correctly describe estuaries based on the material.

They occur where a freshwater river or stream meets the ocean.

They are part of saltwater/marine biomes.

Mixing occurs because of tidal action.

They are purely freshwater bodies with no salt influence.

Which statement correctly compares salt concentration in freshwater and marine biomes?

Marine biomes have about 3% salt; freshwater biomes have 0.1%

Freshwater biomes have about 3% salt; marine biomes have 0.1%

Both freshwater and marine biomes have about 1% salt

Freshwater biomes have no dissolved salts; marine biomes have 10%

Select all statements that accurately describe global coverage by water types.

Marine biomes cover around 97% of Earth’s surface

Freshwater makes up less than 3% of Earth’s water supply

Freshwater covers roughly half of Earth’s land area

Marine biomes make up less than 3% of Earth’s water supply

Which description best defines the intertidal zone presented in the material?

A transition area between land and sea affected by tides

A deep ocean region with no sunlight

A freshwater river delta far inland

A polar marine area covered by ice year-round

Organisms in the intertidal zone benefit most from which adaptation, according to the material?

Ability to attach to a substrate to avoid being carried away by tides

Ability to photosynthesize at night

Ability to migrate long distances across open ocean

Ability to live only in constant water depth

Select the traits that organisms in intertidal zones typically need to survive, based on the material.

Tolerance for a wide range of water levels

Tolerance for varying levels of air exposure

Ability to attach to a substrate

Strict requirement for constant submersion

Which group of organisms is specifically mentioned as inhabiting intertidal zones in the material?

Urchins, sea stars, and anemones

Jellyfish, sharks, and dolphins

According to the definition provided, what does primary productivity measure?

The rate at which sunlight is converted into organic compounds through photosynthesis

The total biomass present in an ecosystem

The amount of oxygen released by producers

The percentage of organisms that survive to adulthood

Select the statements that correctly describe net primary productivity.

It is the amount of organic matter remaining after accounting for cellular respiration by photosynthetic organisms.

It can be represented as gross primary productivity minus cellular respiration.

It equals the total chemical energy produced during photosynthesis without any losses.

It is unrelated to glucose production or use.

Which equation correctly represents the relationship among net primary productivity, gross primary productivity, and cellular respiration?

Net primary productivity = gross primary productivity − cellular respiration

Net primary productivity = gross primary productivity + cellular respiration

Net primary productivity = cellular respiration − gross primary productivity

Net primary productivity = gross primary productivity × cellular respiration

Consider the ocean photo showing sunlight over the water. What does this visual emphasize about primary productivity in oceans?

Oceans are biologically productive because sunlight drives photosynthesis, converting light to organic compounds.

Primary productivity in oceans occurs mainly at night when photosynthesis is maximized.

Ocean productivity is determined only by animal respiration, not by light availability.

Sunlight reduces primary productivity by breaking down organic compounds.

Which statement best distinguishes gross primary productivity from net primary productivity?

Gross primary productivity is the total organic matter produced during photosynthesis, whereas net primary productivity is the remaining organic matter after subtracting respiration.

Gross primary productivity accounts for respiration losses, while net primary productivity does not.

Gross primary productivity is the glucose used in cellular processes, whereas net primary productivity is the glucose produced.

Gross primary productivity refers to animal energy intake, whereas net primary productivity refers to plant energy intake.

According to the summary, which statement correctly distinguishes the two major categories of aquatic biomes?

Freshwater biomes have low salt concentrations, while marine biomes have higher salt concentrations

Both freshwater and marine biomes have the same salt concentration

Marine biomes have no salt, while freshwater biomes are salty

Freshwater and marine biomes differ only in temperature, not in salt concentration

Which explanation best describes why marine biomes have high primary productivity?

They contain many photosynthetic organisms that generate organic matter

They receive more rainfall than freshwater biomes

They cover less area, concentrating nutrients

They have colder temperatures that slow respiration

Select all statements that align with the summary of aquatic biomes.

Aquatic biomes are categorized into freshwater and marine

Marine biomes generally have higher salt concentrations than freshwater biomes

Photosynthetic organisms contribute to productivity in marine environments

Primary productivity is low in marine biomes due to few producers

According to the passage, which statement best describes the ocean’s role in global photosynthesis?

Almost half of global photosynthesis occurs in the ocean and is carried out by phytoplankton

Nearly all global photosynthesis occurs on land by terrestrial plants

Photosynthesis happens equally across all parts of the ocean

Only coastal mangrove forests contribute to oceanic photosynthesis

Select all statements that are supported by the passage about primary productivity in marine environments.

Phytoplankton are responsible for a large share of global photosynthesis

The open ocean has low primary productivity despite its vast area

Algal beds and coral reefs have the highest primary productivity on Earth

Photosynthesis is distributed evenly throughout the ocean

Which group performs most oceanic photosynthesis?

Benthos (bottom-dwelling animals)

Only about 0.1% of Earth’s surface consists of algal beds and coral reefs. What makes these areas remarkable, according to the passage?

They have the most primary productivity on Earth

They have low biodiversity but high nutrient levels

They contribute the least to marine productivity

They are found only in polar regions

Use the image of the open ocean to infer why photosynthesis might not occur equally throughout the ocean. Choose the best explanation grounded in the passage and typical conditions shown.

Large expanses of nutrient-poor open waters lead to low productivity despite vast area

Uniform nutrient levels across the ocean make productivity equal everywhere

High concentrations of reef-building organisms in the open ocean boost productivity

Frequent coastal upwelling in the open ocean increases productivity

Which statement best describes the euphotic zone of the ocean?

The sunlit layer where sunlight is able to penetrate the water, typically down to around 200 m

A deep region where no sunlight penetrates and photosynthesis cannot occur

A cold, dense layer below 1000 m where nutrients accumulate

A zone defined only by salinity changes rather than light

In the euphotic zone, which group acts as primary producers that influence the populations and distribution of other organisms?

Phytoplankton including microscopic bacteria, algae, and plants

Deep-sea chemosynthetic bacteria

Select the statements that are true about phytoplankton in the euphotic zone.

They have plenty of light available for photosynthesis.

They are limited by nutrient availability in the ocean.

They control the populations and distribution of other organisms.

They are mainly large multicellular animals.

What is a thermocline?

A thin layer in the water where temperature changes quickly, dividing upper and lower layers

A salty layer that increases evaporation

A region of constant temperature throughout the water column

A zone where light is completely absent

Why do the warmer waters of the euphotic zone often not mix with the colder, denser waters below?

Because the temperature gradient across the thermocline prevents mixing of the layers

Because winds always blow surface water offshore

Because salinity is identical at all depths

Because tides continuously homogenize the water column

How can the separation of warm surface water and cold deep water affect nutrients?

It restricts the flow of nutrients into the euphotic zone except where upwelling occurs.

It increases nutrient flow to surface waters everywhere.

It has no effect on nutrient movement.

It dilutes nutrients in deep waters only.

Which scenario would most likely enhance nutrient availability in the euphotic zone?

Specific areas of upwelling that bring deeper water to the surface

Strong thermocline with no vertical movement

Continuous heating of surface waters

Select the processes or conditions that directly influence nutrient distribution relative to the euphotic zone.

Thermoclines separating warm and cold layers

Upwelling that transports deeper water upward

Sunlight penetration increasing photosynthesis

Uniform mixing of the entire water column at all times

Which statement correctly connects sunlight penetration and the majority of the ocean?

Only a small fraction of the ocean is sunlit; most does not receive sunlight beyond about 200 m.

Most of the ocean receives strong sunlight throughout its depth.

Sunlight penetrates uniformly to 1000 m in all oceans.

Sunlight reaches deeper in colder water due to higher density alone.

According to the instructional text, which condition most directly increases ocean productivity by allowing nutrients to mix into surface waters?

Absence of thermoclines restricting nutrient flow

Strong thermoclines that trap deep water

Persistent cloud cover blocking sunlight

Low river input of sediments and nutrients

Which statement best explains why productivity can be high near the mouths of rivers?

Rivers deliver nutrients that fuel phytoplankton growth

Rivers add warm water that dissolves thermoclines

River flow strengthens Coriolis forces on coastal currents

Rivers increase salinity, reducing light penetration

Select all conditions that typically lead to low ocean productivity in the open ocean.

Presence of strong thermoclines that block deep nutrients

Lack of sunlight for photosynthesis in extremely northern oceans

Abundant nutrients from river mouths

Frequent upwelling along western coasts

Match each factor with its effect on ocean productivity.

Coriolis effect near western coasts or the equator

Lack of sunlight in far northern oceans

Types of Aquatic Biomes and Estuaries

Quiz

•

Science

•

9th Grade

•

Practice Problem

•

Hard

•

NGSS

MS-LS2-3, MS-LS1-6, MS-LS2-1

+10

Standards-aligned

Elizabeth Horne

Used 12+ times

FREE Resource

62 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement best identifies the two major categories of aquatic biomes?

Freshwater and saltwater (marine)

Rivers and oceans

Wetlands and estuaries

Lakes and streams

2.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Select all examples of freshwater biomes from the list.

Lakes

Oceans

Rivers/Streams

Estuaries

Wetlands

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which option lists saltwater (marine) biomes according to the material?

Lakes and wetlands

Oceans and estuaries

Rivers and streams

Ponds and marshes

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Aquatic biomes are categorized by which combination of abiotic factors?

Nutrient cycles, plate tectonics, and wind speed

Salinity, temperature, and amount of sunlight

Latitude, altitude, and rainfall

pH, soil type, and cloud cover

Match each biome category to one example from that category.

Estuaries

Saltwater/Marine

Lakes

Freshwater

Rivers/Streams

Saltwater/Marine

Oceans

Freshwater

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to the definition provided, what is an estuary?

A lake formed by glacial meltwater

The mouth of a river where freshwater meets the ocean and mixes with saltwater due to tides

A section of the deep ocean where sunlight does not penetrate

A wetland that only contains freshwater year-round

Which process primarily causes mixing of fresh and salt water in an estuary?

Evaporation

Tides

Groundwater seepage

Photosynthesis

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Types of Aquatic Biomes and Estuaries

62 questions

Which statement best identifies the two major categories of aquatic biomes?

Select all examples of freshwater biomes from the list.

Which option lists saltwater (marine) biomes according to the material?

Aquatic biomes are categorized by which combination of abiotic factors?

Match each biome category to one example from that category.

According to the definition provided, what is an estuary?

Which process primarily causes mixing of fresh and salt water in an estuary?

Select all statements that correctly describe estuaries based on the material.

Which statement correctly compares salt concentration in freshwater and marine biomes?

According to the material, how much of Earth’s surface is covered by marine biomes?

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