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Ch 6 Communities and Ecosystem Dynamics

Total questions: 81

Worksheet time: 3hrs 44mins

Name
Class
Date
1.

The level of biodiversity that involves a variety of habits and communities is _____ diversity.

a)

ecosystem

b)

population

c)

genetic

d)

species

2.

What level of biodiversity is most commonly equated with the overall concept of biodiversity?

a)

genetic

b)

ecosystem

c)

species

d)

population

3.

Why is biodiversity important to ecosystems?

a)

It helps populations adapt to ecological changes.

b)

It increases at each level of the food chain.

c)

It provides more abiotic factors for the ecosystem.

4.

How many species are known to be living on Earth?

a)

between 10,000 and 100,000

b)

between 1 and 2 million

c)

between 5 and 9 million

d)

between 10 and 50 million

5.

Biodiversity, aka biological diversity, usually refers to

a)

the same species in a general location

b)

the number of different species in a given area

c)

the number of animal species in a given area

d)

the number of plant species in a given area

6.
Which habitat exhibits the greatest biodiversity?
a)
A habitat with 15 different species with about 300 individuals each
b)
A habitat with 10 different species with about 75 individuals each
c)
A habitat with 4 different species with about 150 individuals each
d)
A habitat with only one species with about 2000 individual
7.

Define genetic diversity

a)

variation of genes within a species or population in a given area

b)

variety of ecosystems in a given area

c)

system made up of all the living and nonliving things in a given area

d)

disturbance in the environment conditions that cause genetic changes to occur in organisms

8.

Which statement best describes an example of low species diversity?

a)

A population of frogs has a wide variety of skin colors

b)

A marsh ecosystem is covered by a single species of cattail bulrushes

c)

A state park includes multiple forest, wetland, and freshwater ecosystems

9.

Which statement best describes an example of high species diversity?

a)

A pond ecosystem is populated by a single species of frogs

b)

A state park includes multiple forest and freshwater ecosystems with many different species of fish, frogs, and birds

c)

A desert ecosystem is populated only by organ pipe cacti, camels, and armadillo lizards

10.

Which of the following in not an example of a keystone species?

a)

Beavers

b)

Round Gobies

c)

Sharks

d)

Sea Otters

11.

Which level of biodiversity helps to prevent the negative effects of bottlenecks?

a)

Ecosystem diversity

b)

Genetic diversity

c)

Species diversity

12.

Ecotourism is a form of tourism that supports the conservation and sustainable development of ecologically unique areas.

a)

True

b)

False

13.

A mixture of two different types of crops is known as...

a)

keystone species

b)

ecotourism

c)

hybrids

d)

endemic species

14.

Which of the following is not one of the advantages of biodiversity to humans?

a)

Medical uses

b)

Recreation

c)

Industrial uses

d)

Bottlenecks

15.

In the woods, there are hawks and robins. They both try to occupy the same niche by competing for worms as the only source of food in that same area at that same time. The hawks outcompete the robins, and the robins are forced to leave that area. This is an example of:

a)

Mutualism

b)

The competitive exclusion principle

c)

Commensalism

d)

Neutralism

16.

Barnacles are animals that cannot move. In order to get food, they attach to whales and catch any floating plankton in the water. The whale is neither helped nor harmed in the interaction. What type of symbiosis is this?

a)

Mutualism

b)

Commensalism

c)

Parasitism

d)

Amensalism

17.

In the sea, little fish called pilot fish swim closely to sharks. The pilot fish clean the sharks, and the sharks provide protection for the pilot fish. What type of symbiosis is this?

a)

Mutualism

b)

Commensalism

c)

Parasitism

d)

Amensalism

18.

In an ecosystem, there are populations of deer, rabbits, grass, and pine trees. Suddenly, a fire blazes through the area, which kills all of the populations. As the months go on, new species of grass begin to take root. This attracts animals, and eventually the ecosystem is restored.


What type of ecological succession happened?

a)

Primary succession because it started with rocks.

b)

Primary succession because there was soil to begin with, and plants existed before the disaster.

c)

Secondary succession because it started with rocks.

d)

Secondary succession because there was soil to begin with, and plants existed before the disaster.

19.

In Hawaii, there are volcanoes. Before anything was there, the volcanoes erupted which produced volcanic rock. Lichens were the first species to arrive, and they broke down the rock into soil. Eventually, plants began to grow. Now, the islands are functioning at their climax community.

Is this an example of primary or secondary succession?

a)

Primary succession

b)

Secondary succession

20.

In Hawaii, there are volcanoes. Before anything was there, the volcanoes erupted which produced volcanic rock. Lichens were the first species to arrive, and they broke down the rock into soil. Eventually, plants began to grow. Now, the islands are functioning at their climax community.

What is the pioneer species in this example?

a)

Shrubs

b)

Lichens

c)

Trees

d)

Rock

21.

What is this picture describing?

a)

It is describing direct competition between flamingos and ducks.

b)

It is describing natural selection as it follows the disruptive selection pattern.

c)

It is describing the niche of each bird within the tree.

d)

It is describing abiotic factors of the tundra.

22.

What term describes the range of conditions that an organism can endure and survive in?

a)

Habitat

b)

Niche

c)

Microclimate

d)

Tolerance

23.

In this photo, two lions are fighting for a resource. What type of competition is this?

a)

Interspecific competition

b)

Intraspecific competition

c)

Machismo

d)

Competitive exclusion principle

24.

What is this picture describing?

a)

It is describing how two organisms cannot occupy the same niche in the same place at the same time through the competitive exclusion principle.

b)

It is illustrating the intercompetitive inclusion principle.

c)

It is describing the amount of time it takes for bacteria to reach exponential growth.

d)

It is illustrating the mutualistic relationship between two organisms when they live in the same niche.

25.

This photo is showing the differences in annual rainfall. What best describes why there are differences on this island?

a)

The rainfall is different because people can control the weather on Maui.

b)

There are microclimates on Maui which produce differences in the average amount of rainfall.

c)

The microhabitats provide different shelters for different organisms.

d)

The differences in organism symbioses produces a range of rainfall.

26.

This photo is showing the same ecosystem in 2 scenarios: one with the sea otter and one without the sea otter. In the ecosystem without the sea otter, the ecosystem dynamics are completely changed. What term best describes the sea otter?

a)

Niche

b)

Climax community

c)

Pioneer species

d)

Keystone species

27.

T/F: Biodiversity is a good thing because it provides variety in an ecosystem.

a)

True

b)

False

28.

What term describes the ability of an organism or ecosystem to adapt after a disturbance?

a)

Tolerance

b)

Resilience

c)

Biodiversity

d)

Niche

29.

Many different organisms are competing for the zebra as food. What type of competition is this?

a)

Intraspecific competition

b)

Interspecific competition

30.

The actual place an organism lives is its

a)

house

b)

habitat

c)

ecosystem

d)

environment

31.

True or False: There are physical and biological environmental factors that affect which organisms can live in a habitat

a)

True

b)

False

32.

Habitats where really small organisms live is called a

a)

microenvironment

b)

microhabitat

c)

microbiome

d)

a and b

33.

A microhabitat has its own set of environmental conditions called its

a)

climate

b)

macroclimate

c)

microclimate

d)

small biome

34.

Microbes in the soil have an important job. What is it

a)

Decomposers

b)

giving nutrients to plants

c)

Absorption

d)

A and b

35.

The variety of environmental conditions which an organism survives and reproduces is called

a)

adaptation

b)

microbiome

c)

tolerance

d)

optimum range

36.

These conditions enable organisms to find enough energy and nutrients to maintain homeostasis, to grow and reproduce

a)

adaptation

b)

microclimate

c)

Tolerance

d)

Optimum Range

37.

If conditions fall above or below the optimum range an organisms will experience

a)

Death

b)

stress

c)

adaptation

d)

tolerance

38.

Where an organism lives and what it does for a living, including how they interact with biotic and abiotic factors is a species

a)

habitat

b)

ecosystem

c)

niche

d)

community

39.

Any necessity essential for live is called

a)

food

b)

water

c)

a resource

d)

shelter

40.

When more than one organism attempts to use the same resource you have

a)

competition

b)

adaptation

c)

niche

d)

death

41.

What states that no two species can occupy exactly the same niche in exactly the same habitat at the same time

a)

competitive inclusion principle

b)

competitive exclusion principle

c)

competitive adaptation

d)

competitive nice principle

42.

What contains numerous producers and many consumers on several trophic levels

a)

food chain

b)

food pyramid

c)

food niche

d)

food web

43.

True or False: Predator Prey relationships do not affect populations

a)

True

b)

False

44.

True or False: Herbivores impact the plant population

a)

True

b)

False

45.

A species that plays a vital role in maintaining structure, stability, and diversity in an ecosystem.

a)

Nice Species

b)

Major Species

c)

Impact species

d)

Keystone Species

46.

True or False: A keystone species has a powerful influence on an ecosystem

a)

True

b)

False

47.

A close interdependent relationship between two species is called

a)

symbiosis

b)

nice

c)

clinger

d)

Mutual Relationship

48.

When one species benefits and the other is not harmed

a)

mutualism

b)

commensalism

c)

parasitism

d)

adaptations

49.

A relationship where both species benefit

a)

mutualism

b)

commensalism

c)

parasitism

d)

adaptation

50.

A relationship where one species benefits and the other is harmed

a)

mutualism

b)

commensalism

c)

parasitism

d)

adaptation

51.

A series of somewhat predictable events that occur in a community over time

a)

Ecological Parasitism

b)

Ecological Community

c)

Ecological Succession

d)

Ecological imprint

52.

Succession that begins on newly formed rock or other areas that have no remnants of an older community is called

a)

Secondary Succession

b)

Primary Succession

c)

Primo Succession

d)

No Succession

53.

The first species to colonize barren areas

a)

first species

b)

pioneer species

c)

pioneer adapter

d)

new life

54.

When a disturbance affects an existing community but doesn't completely destroy it what occurs?

a)

primary succession

b)

secondary succession

c)

secondary adaptation

d)

primary adaptation

55.

True or False: Succession occurs in most cases by each species altering its environment in ways to make it easier for other species to compete for resources and survive.

a)

True

b)

False

56.

A community that is specific, uniform and stable is called a

a)

adapt community

b)

climax community

c)

new commuinty

d)

balanced community

57.

True or False: Humans have no impact on the environment and do not impact succession.

a)

True

b)

False

58.

The total of all genetically based variation in all organisms in the biosphere is called

a)

differentation

b)

superdiversity

c)

biodiversity

d)

diversity

59.

The variety and variability of habitats, communities, and ecological process in the biosphere is

a)

Ecosystem Adaptation

b)

Ecosystem diversity

c)

Ecosystem differential

d)

Ecosystem standard

60.

The number of different species in the biosphere, or in a particular area

a)

Ecosystem Diversity

b)

Genetic Diversity

c)

Species Diversity

d)

Biosphere diversity

61.

The total of all different forms of genes present in a particular species.

a)

Genetic Diversity

b)

Species Diversity

c)

Ecosystem Diversity

d)

Biosphere diversity

62.

True Or False: Biodiversity has man benefits

a)

True

b)

False

63.

A natural or human system's ability to recover after a disturbance is

a)

adaptation

b)

ecosystem diversity

c)

commensalism

d)

resilience

64.

True or False: Resilient ecosystems have some ability to adapt to changes over time

a)

True

b)

False

65.

The benefits provided by ecosystems to humans are called

a)

Ecosystem adaptations

b)

Ecosystem services

c)

Ecosystem benefits

d)

none of the above

66.

Natural disturbances, such as fires or hurricanes, can result in

a)

A.parasitism.

b)

B.competition.

c)

C.commensalism.

d)

D.succession.

67.

The end result of ecological succession is usually a(n)

a)

A.land biome.

b)

B.aquatic biome.

c)

C.unstable community.

d)

D.climax community.

68.

Which of the following is not a possible cause of ecological succession?

a)

A. fire

b)

B. flood

c)

C. earthquake

d)

D. change of season

69.

. Which of the following is an example of primary succession?

a)

A.lichens growing on rocks following a volcanic eruption

b)

B.grasses growing after a forest fire

c)

C.oak trees replacing pine trees in a forest

d)

D. non-native species introduced into a climax community

70.

Which of these organisms would you most expect to find on a small island that formed as a result of a volcanic two years prior?

a)

A.climbing vines

b)

B.hardwood tree

c)

C.monkey

d)

D.lichen

71.

Which of the following describes how an abiotic factor can impact the population dynamics in an ecosystem?

a)

A. A parasite that invades a host can reproduce and cause a decline in the host species population.

b)

B. Organisms that compete for the same resources will keep each other from overpopulating.

c)

C. Predators will prevent herbivores from depleting the plants and other resources in an ecosystem.

d)

D. Seasonal variations in temperature can cause some of the individuals in a population to die.

72.

How is primary succession different from secondary succession?

a)

Primary succession starts with soil.

b)

Secondary succession start with bare rock.

c)

Primary succession starts with bare rock, with lichens and moss.

d)

Fire is an example of primary succession.

73.

Examples of Abiotic Factors include:

a)

Weather, birds, plants, and animals

b)

Rocks, reptiles, shrubs, trees, and grasses

c)

Weather, wind, rain, sunlight, and rocks

d)

Birds, plants, animals, reptiles, shrubs, trees, and grasses

74.

Several years after a building had been torn down and the ground cleared, grasses began to grow in that area. After 10 years, small bushes replaced the grasses. This pattern of plant growth is known as:

a)

Biological

control

b)

Cover cropping

c)

Ecological

succession

d)

Land-use

management

75.

A volcano in a mountainous, wooded region erupts, spewing tons of ash and destroying the forested area around the volcano. If the volcano remains dormant during

the next 1000 years, what will probably happen?

a)

The area will be repopulated by trees, eventually becoming a

forest again.

b)

The mountains will erode and remain without life.

c)

The area will remain unchanged, covered by volcanic ash.

d)

The area will turn into a completely different habitat, such as

desert of plains.

76.

How has the invasion of pythons effected the everglades ecosystem in terms of species numbers?

a)

The pythons could upset the territorial boundaries of native organisms.

b)

The pythons could adapt to overcome diseases common to native snakes.

c)

The pythons could prey on native organisms and cause native populations to decline.

d)

The pythons could begin to interbreed with native snakes and produce a more successful species.

77.

Scientists found, that over a period of 200 years, a mountain pond was transformed into a meadow. During that time, several communities of organisms were replaced by different communities. Which of these best explains why new communities were able to replace older communities?

a)

A.The original species became extinct.

b)

A.Species in the older community died from old age.

c)

A.The abiotic characteristics of the habitat changed.

d)

A.Diseases that killed the older organisms disappeared.

78.

Which is a natural cause of

ecosystem change?

a)

A. Farming

b)

B. Building fences

c)

C. Pollution

d)

D. Hurricane

79.

Which of the following best

describes biodiversity

a)

A. a diverse Biology class

b)

B. variety of all life on earth

c)

C. a variety of plants

d)

D. a variety of animals

80.

Abandoned railroad tracks are overgrown with weeds. Ten years later there are small aspen trees growing in the middle of the tracks. This change is an example of:

a)

Primary succession

b)

Biological evolution

c)

Secondary succession

d)

Heterotrophic nutrition

81.

Which of the following is not a result of climate change partially caused by burning fossil fuels?

a)

Leaves changing color in the fall months.

b)

Caribou not being able to receive food for their young because of an earlier spring season.

c)

Ice melting in the polar regions, causing polar bears to drown.

d)

Acid rain falling on homes and buildings.