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Competition and Interactions in Ecosystems

Total questions: 63

Worksheet time: 55mins

Name
Class
Date
1.
Which organism do the owl and the weasel compete for in the food web?
a)
Hawk
b)
Spider
c)
Grasshopper
d)
Shrew
2.

Identify which image below is showing a population:

a)
b)
c)
d)
3.

What term describes organisms striving for the same limited resources?

a)

Competition

b)

Predation

c)

Mutualism

d)

Commensalism

4.
The primary consumer in this food chain is
a)
predator
b)
zooplankton
c)
plankton
d)
small fish
5.
Where does all of the energy in any food chain come from?
a)
producers
b)
consumers
c)
herbivores
d)
the sun
6.
An organism that only eats plants, and does not hunt is
a)
scavenger
b)
omnivore
c)
herbivore
d)
carnivore
7.
A type of consumer that only eats meat is a
a)
herbivore
b)
omnivore
c)
carnivore
d)
decomposer
8.

These are organisms that feeds on plants or other animals for energy.

a)

Producer

b)

Consumer

9.

This can make its own food, like plants.

a)

Herbivore

b)

Abiotic

c)

Omnivore

d)

Producer

10.

A consumer that eats only plants.

a)

Carnivore

b)

Omnivore

c)

Herbivore

11.

Animal that feeds only on the flesh of other animals.

a)

Herbivore

b)

Omnivore

c)

Carnivore

12.

A consumer whose normal diet includes both plants and animals.

a)

Carnivore

b)

Omnivore

c)

Herbivore

d)

Plant

13.

Another word for a living thing is a:

a)

animal

b)

organism

c)

plant

d)

community

14.

Herbivores eat

a)

Everything

b)

only plants.

c)

only meat

15.

Plants are...

a)

producers

b)

herbivores

c)

omnivores

16.
Which of the following is NOT a consumer
a)
grass
b)
dog
c)
shark
d)
fish
17.
In 1970, approximately how many moose were present in the ecosystem?
a)
40
b)
800
c)
50
d)
1400
18.
What could be a possible explanation for what is happening to the moose population from 1986 - 1987?
a)
Moose have very little food.
b)
There are fewer predators.
c)
There is a disease in the moose population.
d)
There is a lack of mates in the moose population.
19.
In the relationship on the graph, who is the predator and who is the prey?
a)
Predator = wolf / Prey = wolf
b)
Predator = moose / Prey = wolves
c)
Predator = moose / Prey = moose
d)
Predator = wolf / Prey = moose
20.
Based on the information in the graph, what is a possible explanation for what is happening to the wolf population from 1980 - 1982?
a)
There is too much food around.
b)
The wolves hunted more moose.
c)
Wolves were leaving the ecosystem.
d)
There was a decrease in the wolves' food supply.
21.

The graph here shows the populations, over several years, for two animals that share a habitat. Foxes are mammals that hunt for food, and grouse are birds, a common prey animal of foxes.

According to the data, in which year did the population of foxes show a decrease that is most likely the result of a decrease in the availability of a source of food?

a)

2003

b)

2005

c)

2008

d)

2012

22.

Non-Living things that affect the ecosystem

a)

biotic

b)

abiotic

c)

dead

d)

zombies

23.

Living things that affect the ecosystem.

a)

rocks

b)

pokemon

c)

abiotic

d)

biotic

24.

Competition in an ecosystem occurs when

a)

animals get bored.

b)

more than one individual or population in an ecosystem relies (needs) the same limited resource.

c)

there is more than enough of a resources for every living organism.

d)

resources are unlimited.

25.

When an organism depends on a factor for survival, this is called a ______________________ interaction.

a)

independent

b)

questionable

c)

dependent

d)

expendable

26.

A system made up of all the biotic and abiotic factors in an area and all the interactions among them.

a)

Ecosystem

b)

Niche

c)

Adaptation

d)

Nutrasystem

27.

A group of individuals from the same species living and interacting together in the same ecosystem is called a

a)

organism.

b)

troup.

c)

zebra festival.

d)

population.

28.

A self-contained living thing. Examples include bacteria, douglas fir tree, wolf, turkey, madrone, salmon.

a)

ecosystem

b)

organism

c)

cell

d)

abiotic

29.

Hawks and owls eat the same type of food and struggle with one another to get their food. What is this an example of?

a)

Competition

b)

Biotic factor

c)

Symbiosis

d)

Population

30.

Competition becomes more important as the number of individuals ______ or the availability of resources _________.

a)

increases, decreases

b)

increases, increases

c)

decreases, increases

d)

decreases, decreases

31.
Any thing or organism that regulates the size of a population of another organism is known as __________.
a)
a limiting measure
b)
a limiting factor
c)
factorization
d)
materialization of precipitation
32.

The graph to the right shows the interaction of the wolf and moose populations on Isle Pekie. If the moose population continues to increase, the wolves' food supply will increase. What will most likely happen to the wolf population as a result?

a)

It will decrease.

b)

It will increase.

c)

It will remain the same.

33.

What is a group of interacting individuals of the same species located in the same area?

a)

ecosystem

b)

abiotic factor

c)

biotic factor

d)

population

34.

What is a source or supply that benefits organisms?

a)

resource

b)

limited resource

c)

organism

d)

secondary consumer

35.

What is an animal that eats primary consumers?

a)

abiotic factor

b)

dependent Interaction

c)

Secondary consumers

d)

primary consumers

36.

What do you call an organism that gets its energy by feeding on producers in the food chain?

a)

secondary consumer

b)

primary consumer

c)

limited resource

d)

biotic factor

37.

What is a living thing that affects the ecosystem?

a)

abiotic factor

b)

resource

c)

dependent interaction

d)

biotic factor

38.

_____________ is when more than one individual or population in an ecosystem relies on the same limited resources.

a)

ecosystem

b)

population

c)

competition

d)

organism

39.

An _____________ is a system comprising all the biotic and abiotic factors in an area and all the interactions among them.

a)

ecosystem

b)

population

c)

primary consumer

d)

competition

40.

What is a nonliving thing that affects the ecosystem?

a)

resource

b)

biotic factor

c)

ecosystem

d)

abiotic factor

41.

When an organism depends on a factor for survival this is considered a _____________

a)

limited resource

b)

secondary consumer

c)

organism

d)

dependent interaction

42.

Which of these is NOT a limited resource organisms compete for in a community?

a)

Wind

b)

Food/Water

c)

Mates

d)

Sunlight

43.

When the insect population increases, the toad population:

a)

increases

b)

decreases

c)

stays the same

44.

The toad increases when the insects increase because...

a)

the toad rely on the insects for food

b)

the insects rely on the toad for food

c)

the toad don't affect the insects

45.

Hummingbirds eat nectar producing flowers. From 1986 to 1989, it’s likely that the amount of these flowers in hummingbird habitats ____________________.

a)

increased

b)

decreased

c)

stayed the same

46.

What role do decomposers play in an ecosystem?

a)

They produce their own food through photosynthesis

b)

They consume living plants and animals

c)

They break down dead material and recycle nutrients back into the ecosystem

d)

They regulate the population of other species

47.

In an ecosystem, primary consumers are also known as:

a)

Herbivores

b)

Carnivores

c)

Omnivores

d)

Decomposers

48.

Explain how energy flows through an ecosystem, starting from the sun and ending with decomposers.

a)

Energy is captured by producers, transferred to consumers, and finally to decomposers.

b)

Energy is captured by decomposers, transferred to consumers, and finally to producers.

c)

Energy is captured by consumers, transferred to producers, and finally to decomposers.

d)

Energy is captured by decomposers, transferred to producers, and finally to consumers.

49.

How is commensalism different from mutualism?

a)

In commensalism, one species benefits while the other is unharmed; in mutualism, both species benefit

b)

In commensalism, one species is harmed while the other benefits; in mutualism, both species benefit

c)

In commensalism, neither species is harmed; in mutualism, one species is harmed

d)

In commensalism, both species benefit; in mutualism, one species is harmed

50.
Barnacles create home sites by attaching themselves to whales. This relationship neither harms nor benefits the whales. 
a)
parasitism
b)
commensalism
c)
mutualism
51.
Mistletoe extracts water and nutrients from a spruce tree. The spruce tree is harmed. 
a)
parasitism
b)
commensalism
c)
mutualism
52.
 The stork uses it saw-like bill to cut up the dead animals it eats. As a result, the dead animal carcass is accessible to some bees for food and egg laying. The relationship neither harms nor benefits the stork.
a)
parasitism
b)
commensalism
c)
mutualism
53.
Two male Giraffes are fighting over the last green leaf of a tree that is dying.  
a)
Competition
b)
Mutualsim
c)
Predation
d)
Commensalism
54.
A coyote captures, kills, and eats a rabbit. What type of symbiotic relationship is this?
a)
mutualism
b)
commensalism
c)
parasitism
d)
predation
55.

Match these terms

a)
Mutualism 
1.

both organisms benefit

b)
Parasitsm 
2.

one organism harms the other

c)
Commensalism 
3.

one benefits; the other doesn't care

56.

Tapeworms live in the small intestines where it feeds and grows, robbing the human of essential nutrients.

a)

Parasitism'

b)

Predation

c)

Competition

d)

Mutualism'

57.

The Remora fish swim alongside the shark and take scraps of food that the shark drops during feeding. The shark does not eat the Remora and appears unaffected by its presence.

a)

Parasitism

b)

Predation

c)

Competition

d)

commensalism

58.

What is an invasive species?

a)

A native (naturally found) species which are added to an area

b)

A non-native (not naturally found) species added to an area

c)

A keystone species in an environment

d)

none of the above

59.

What is something that is common to most invasive species?

a)

they don't have many predators in their new area

b)

they don't live long

c)

they can't have babies in the new area

d)

they can't eat anything in the new area

60.

In the energy pyramid here, which organisms have the most energy available?

a)

Producers

b)

primary consumer

c)

secondary consumer

d)

tertiary consumer

61.

The consumers that are the top carnivores that eat other carnivores

a)

Tertiary

b)

Secondary

c)

Primary

62.

What kind of organisms are usually primary consumers?

a)

plants

b)

herbivores

c)

carnivores

63.
Corn-->mouse-->snake-->hawk
The mouse in this diagram represents a 
a)
Producer
b)
Primary Consumer
c)
Secondary Consumer
d)
Decomposer

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