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Gr7 Final Revision Term 3

Total questions: 62

Worksheet time: 1hrs 22mins

Name
Class
Date
1.

In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

a)

burning . . . photosynthesis

b)

fixation . . . decomposition

c)

decomposition . . . photosynthesis

d)

respiration . . . decomposition

e)

respiration . . . photosynthesis

2.

How does the human body return carbon to the atmosphere in the carbon cycle?

a)

Waste products

b)

Photosynthesis

c)

Cellular respiration

d)

Formation of glucose

3.

Humans burn fossil fuels and wood, releasing carbon dioxide into the atmosphere. This carbon dioxide is then absorbed by trees for photosynthesis. These processes are contributory to which chemical cycle?

a)

The carbon cycle

b)

The water cycle

c)

The nitrogen cycle

d)

The phosphorous cycle

4.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
5.

Decomposition...

a)

releases carbon dioxide into the atmosphere when plants and animals breathe out

b)

helps plants create their own food using sunlight, water, and carbon dioxide

c)

creates carbon dioxide from dead and decaying plants and animals

d)

when we burn things such as trees, decaying plants and animals, and fossil fuels

6.

Carbon atoms cannot be created or destroyed

a)

True

b)

False

c)

Not enough information to answer

7.

What is the percentage of the Nitrogen in the air ?

a)

1%

b)

21%

c)

78%

8.

Organisms require nitrogen to make which of the following?

a)

Glucose

b)

Proteins

9.

How nitrogen is "fixed" into useable form for plants...

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria & lightning

10.

A correct path that nitrogen could take would be _____

a)

air -> animals->plants->bacteria

b)

air -> bacteria ->plants -> animals

11.

Bacteria fix nitrogen from the atmosphere into a form plants can use.

a)

True

b)

False

12.
A close long term association between 2 or more species
a)
Mutualism
b)
Commensalism
c)
Symbiosis
d)
Parasitism
13.
Red-billed oxpeckers are birds that often feed on parasites that infest impala.  This is an example of _______.
a)
commensalism
b)
mutualism
c)
neutralism
d)
competition
14.
What type of symbiosis?  Skunks often live in burrows that have been dug and abandoned by woodchucks.  
a)
commensalism
b)
mutualism
c)
parasitism
d)
predation
15.
A relationship between two organisms in which one organism benefits and the other is unharmed...
a)
Mutualism 
b)
Competition
c)
Parasitsm 
d)
Commensalism 
16.
An organism where one organism benefits and another is harmed
a)
Commensalism
b)
Parasitism
c)
Mutualism
d)
Competition
17.
Relationship where both organism benefit
a)
Competition
b)
Commensalism
c)
Mutualism
d)
Parasitism
18.
Natural disasters such as flooding and tornadoes are linked to ________________.
a)
primary
b)
secondary
c)
old field
d)
ecosystem
19.

Which type of succession is quicker?

a)

Primary Sucession

b)

Secondary Succession

20.

A species that plays a critical role in the health, maintenance, growth, or definition of an ecosystem.

a)

keystone

b)

invasive

c)

engineer

d)

predator

21.

The 10% rule states that only 10% of the available energy makes it from one trophic level to the next. If the producers have 100,000 kcals available how many kcals would be available to the primary consumers?

a)

10

b)

100

c)

1,000

d)

10,000

22.

What is an invasive species?

a)

an organism that IS native to an area and causes harm to the environment/humans

b)

an organism that is NOT native to an area and causes harm to the environment/humans

c)

an organism that is NOT native to an area and helps the environment/humans

d)

an organism that IS native to an area and helps the environment/humans

23.

The ACT of hunting another organism.

a)

Predator

b)

Prey

c)

Predation

d)

Niche

24.

The role or job of an organism in an ecosystem.

a)

Predator

b)

Prey

c)

Predation

d)

Niche

25.
The term biodiversity means:
a)
a wide variety of plants and animals in an ecosystem
b)
only a few types of plants and animals in an ecosystem
c)
an ecosystem composed mostly of plants
d)
an ecosystem composed mostly of animals
26.
The number of different species in an area is referred to as its _______________.
a)
population
b)
genetic diversity
c)
biodiversity
d)
Niche diversity
27.

A species that is at risk of serious extinction is called a(n)

a)

threatened species

b)

invasive species

c)

endangered species

d)

extirpated species

28.

What do you call the mating of animals in zoos to preserve biodiversity?

a)

captive breeding

b)

selective breeding

c)

gene pool diversity

29.

Which of the following pose a threat to biodiversity? Choose all that apply.

a)

invasive species

b)

habitat destruction

c)

population growth

d)

pollution

30.

What makes a species "invasive"?

a)

species that cannot adapt

b)

making another species leave so that it can move in

c)

moving to a new ecosystem where it does not naturally belong and taking resources from natives

d)

taking up too much space

31.

Which of the following is NOT a threat to biodiversity?

a)

Pollution

b)

Deforestation

c)

Invasive Species

d)

Ecological Succession

32.

How do animals get the nitrogen they need?

a)

From the air they breathe

b)

From the water they drink

c)

From the food they eat

d)

From the sun

33.
What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?
a)
nitrogen composition
b)
ammonia 
c)
nitrogen fixation
d)
denitrification
34.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
35.

What is resilient ecosystem?

a)

Is an ecosystem that does not exist.

b)

Tending to recover from or adjust easily to misfortune or change.

c)

Is related specifically to the ocean.

d)

Small changes in one part of a system

36.

What is succession?

a)

The first species to populate an area.

b)

Is the same of intereaction

c)

Is Disruption to the physical or biological components.

d)

The series of predictable changes that occur in a community over time.

37.

This diagram shows how energy flows through an eco-system. What is the first source of energy in this pyramid?

a)

sharks and large birds

b)

algae, plankton and seagrass

c)

herbivorous fish, crustaceans and sea urchins

d)

seals and carnivorous fish

38.
Why might an organism have more than one arrow coming from them in a food web?
a)
More than one organism may eat them. 
b)
They may eat more than one other organism. 
c)
This organism gets its energy from multiple sources. 
d)
They have no resources available to them.
39.

Using the food web which of the following is a primary consumer?

a)

butterfy

b)

snake

c)

fox

d)

frog

40.

Using food web which of the following is a secondary consumer?

a)

snake

b)

worm

c)

butterfy

d)

squirrel

41.

Using the food web what would happen if the eagle became extinct?

a)

The rabbit population would increase.

b)

The frog population would increase.

c)

The butterfly population would increase.

d)

The snake population would decrease.

42.

Which of these organisms would receive energy from the snake?

a)

Plant

b)

Rabbit

c)

Mouse

d)

Hawk

43.

In an aquarium fish eat the shrimp, and a shark eats the fish. What would happen to the population of shrimp if the shark was removed from the aquarium?

a)

decrease

b)

stay the same

c)

increase

d)

increase and then decrease

44.
Based on the model, which consumers would receive the greatest amount of energy captured by the producers in their food chains? 
a)
Beluga Whale
b)
Polar Bear and Arctic Hare
c)
Ptarmigan and Arctic Bumble
d)
Lichens and Shrubs
45.
Which group are the producers? 
a)
1 and 2
b)
3 and 4
c)
4
d)
3
46.
How much energy is lost when organisms consume another organism from a different level? 
a)
90%
b)
20%
c)
50%
d)
10%
47.

Species that are in danger of becoming extinct are called __________.

a)

endangered

b)

not lucky

c)

extinct

d)

in a jam

48.

A ______________ species is on its way to becoming endangered or extinct.

a)

threatened

b)

cuddly

c)

sleeping

d)

fossil

49.

Arrows in food webs show:

a)

trophic levels

b)

direction of energy flow

c)

stages of species

d)

predators vs. prey

50.

How much (approx) energy is passed on to a consumer from its food?

a)

100%

b)

1%

c)

10%

d)

0.1%

51.
Carnivores that eat freshly dead organisms are
a)
herbivores
b)
decomposers
c)
omnivores
d)
scavengers
52.
These organisms break down decaying biotic wastes and then return the materials to the ecosystem.
a)
decomposers
b)
scavengers
c)
carnivores
d)
producers
53.

According to natural selection, organisms more suited to their environment are better able to

a)

Sleep

b)

Survive

c)

Perish

d)

Migrate

54.

Nitrogen fixation...

a)

animals eat the plants and other animals that contain nitrogen and release it through their waste

b)

Bacteria in the soil and lightning in the atmosphere “fix” the nitrogen

c)

Once in the ground, bacteria in the soil also nitrify the nitrogen

d)

plants absorb nitrogen through their roots and return it back to the atmosphere

55.

This can transform nitrogen in the atmosphere into a usable form of nitrogen

a)

rain

b)

ice

c)

lightning

d)

sun

56.
Organisms that break down dead plants & animals and release nitrogen back into atmosphere...
a)
bacteria
b)
plants
c)
animals
d)
producers
57.

In the nitrogen cycle, what does label A in the diagram represent?

a)

Gas

b)

Clouds

c)

Carbon dioxide in the atmosphere

d)

Nitrogen in the atmosphere

58.

What is the bottom layer of the an energy pyramid?

a)

producer

b)

tertiary consumer

c)

Secondary consumer

d)

primary consumer

59.
In an energy pyramid, energy_______ as you move up the pyramid.
a)
Increases
b)
Decreases
c)
Stays the same
d)
Changes up and down
60.

Compare and Contrast.

Primary & Secondary succession?

4 lines
61.

Compare and Contrast.

Direct & Indirect Value of Biodiversity?

4 lines
62.

Compare and Contrast.

Mass & Background Extinction?

4 lines

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