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7th Grade #5: Populations, Communities, and Ecosystems

Total questions: 30

Worksheet time: 50mins

Name
Class
Date
1.
succession that occurs in an area with no soil
a)
ecological succession 
b)
primary succession 
c)
secondary succession
d)
pioneer speciles
2.
succession that occurs in an area where soil is already present
a)
ecological succession 
b)
primary succession 
c)
secondary succession
d)
pioneer speciles
3.
the first organisms that appear in an ecological community
a)
ecological succession 
b)
primary succession 
c)
secondary succession
d)

pioneer species

4.
The picture shows what type of succession?
a)
primary
b)
secondary
c)
tertiary
d)
quadanary
5.
What type of succession is shown going from figure A to figure B?
a)
primary succession
b)
eutrophication
c)
secondary succession
d)
intermediate
6.
A tick and a dog have this type of relationship.
a)
mutualism
b)
commensalism
c)
neutralism
d)
parasitism
7.
Cattle egrets are birds that forage in fields among cattle. The egrets get easy access to food and the cattle don't care if they are there or not.
a)
mutualism
b)
commensalism
c)
competition
d)
parasitism
8.
Red-billed oxpeckers are birds that feed on parasites found on an impala. The impala gets rid of parasites and the red-billed oxpeckers get a yummy dinner. This is an example of _______.
a)
commensalism
b)
mutualism
c)
neutralism
d)
competition
9.

A relationship between two organisms in which one organism benefits and the other is unharmed.

a)

Mutualism

b)

Competition

c)

Parasitsm

d)

Commensalism

10.
Barnacles create home sites by attaching themselves to whales. This neither harms nor benefits the whales.
a)
Mutualsim 
b)
Parasitism 
c)
Commensalism 
11.
Mistletoe extracts water and nutrients from the spruce tree to the tree's detriment (harm). 
a)
Mutualsim 
b)
Parasitism 
c)
Commensalism 
12.

A cuckoo and a warbler are both birds. A cuckoo will find the nest of warbler instead of building her own, and she harms the warbler by knocking a warbler egg out of nest and laying her own. When the warbler mother returns, she isn’t aware of the switch. The warbler will then raise the baby cuckoo bird instead of her own baby. Which term best describes this relationship?

a)

Predation

b)

Parasitism

c)

Commensalism

d)

Mutualism

13.

Ostriches and gazelles are two animals that live in Africa. They graze for food near each other because they help each other spot predators. The gazelle has excellent eyesight, but poor hearing, and the ostrich has excellent hearing, but poor eyesight. These two animals will alert one another when danger is near. Which term best describes this relationship?

a)

Predation

b)

Commensalism

c)

Mutualism

d)

Parasitism

14.

Choose everything that is true about primary succession.

a)

pioneer species move in

b)

lichens dissolve rock into soil

c)

soil present

d)

no soil present

e)

occurs rapidly

15.

Choose everything that is true about secondary succession.

a)

pioneer species move in

b)

natural disruptions to ecosystem

c)

soil present

d)

no soil present

e)

occurs rapidly

16.

Choose the reasons animals might become endangered.

a)

too much biodiversity

b)

low genetic diversity

c)

loss of habitat

d)

abundant resources

e)

environmental changes

17.

Mass extinction occurs (a)   .

18.

Background extinction occurs (a)   .

19.

Mass extinction kills (a)   species

20.

What do trees provide for an ecosystem?

a)

water

b)

soil

c)

wind

d)

food

e)

gases

21.

Choose two ways to know that an ecosystem is healthy.

a)

number of organisms in the area

b)

variety of organisms

c)

numerous natural resources

d)

food chain with lots of members

22.

How do humans change the biodiversity of an area?

a)

cutting down trees/plants

b)

building factories

c)

introducing non-native species

d)

pollution from cars

e)

building new subdivsions

23.

The role an organism plays in its environment is its (a)  

24.

What is true of a keystone species?

a)

It has the largest impact on the ecosystem

b)

The ecosystem may collapse without it

c)

It always has the biggest number of organisms in an ecosystem

d)

It's always a producer

25.

What is the main cause of secondary succession?

a)

fires

b)

glacier retreat

c)

formation of new islands

d)

volcanoes

26.

Having a large variety of species in an area helps an environment thrive. This is known as

a)

biodiversity

b)

niche

c)

keystone species

d)

economic value

27.

Genetic ___________ helps species survive.

a)

diversity

b)

similarity

c)

neutrality

28.

  1. (a)   is the interaction where one organism hunts and feeds on another.

29.

Which is a supporting ecosystem service?

a)

nutrient cycling

b)

providing food

c)

climate regulation

d)

cultural heritage

30.

Which is a cultural ecosystem service

a)

Enjoying nature's beauty on a hike

b)

Cutting lumber for housing

c)

The water cycle causing a rain storm

d)

The climate changing to become warmer

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