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Year 9 ecosystems

Total questions: 50

Worksheet time: 25mins

Name
Class
Date
1.

What is a the definition of the term population in terms of ecology?

a)

Individual composed of many specialised cells (living thing).

b)

Group of organisms of the same species in the same area.

c)

populations of organisms living together in the same habit.

d)

Animals of all different types in different areas.

2.

An organism that obtains energy by feeding on other live organisms is called a

a)

Producer

b)

Consumer

c)

Decomposer

3.

What is the relationship called between two organisms in which one organism benefits and the other is unaffected?

a)

Mutualism

b)

Predation

c)

Parasitism

d)

Commensalism

4.

What can we tell from a food web? Select all that apply.

a)

The food chains present in an ecosystem.

b)

The interaction between organisms.

c)

The animals present in an ecosystem

d)

Which species are not dependent on one another.

e)

Nothing

5.
What is the process described in number 1 and 3?
a)
combustion give off CO2, animals eat plants that contain carbon
b)
combustion give off CO2, animals respire and give off CO2
c)
Decomposing matter gives off CO2, animals eat plants which contain carbon
d)
decomposing matter gives off CO2, green plants absorb CO2 for photosynthesis
6.
This is an image of a _________.
a)
consumer
b)
scavenger
c)
decomposer
d)
producer
7.
An illustration that uses arrows to show the many possible directions in which matter and energy can pass through the organisms in an ecosystem.
a)
Food chain
b)
Food web
c)
Energy Pyramid
d)
Succession Map
8.
What role do these organisms play in their ecosystem as they break down matter?
a)
producer
b)
primary consumer
c)
secondary consumer
d)
decomposer
9.
What is the first thing that would happen in this food chain if the grass died?
Sun -> Grass -> Mouse -> Snake -> Hawk
a)
The snake population would increase
b)
the mouse population would increase
c)
the mouse population would decrease
d)
the hawk population would decrease
10.
What are the reactants for cellular respiration?
a)
oxygen and lactic acid
b)
water and glucose
c)
carbon dioxide and water
d)
glucose and oxygen
11.
Which organism is the tertiary consumer?
a)
greenfly
b)
ladybug
c)
robin
d)
hawk
12.
A relationship between two organisms in which one organism benefits and the other is unharmed...
a)
Mutualism 
b)
Competition
c)
Parasitsm 
d)
Commensalism 
13.
When a mosquito bites you, you are the __________ and the mosquito is the  ____________.
a)
host, hostess
b)
parasite, host
c)
host, parasite
d)
prey, predator
14.
Oxpeckers feed on the ticks found on a rhinoceros. The oxpeckers get a meal and the rhinoceros is helped by the removal of the ticks.
a)
parasitism
b)
commensalism
c)
mutualism
15.

What % of the air is made of nitrogen?

a)

21%

b)

52%

c)

61%

d)

78%

16.

True or False. The nitrogen in the atmosphere is in the right form for living things to use.

a)

True

b)

False

17.

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

a)

rain

b)

ice

c)

lightning

d)

sun

18.

What is the role of denitrifying bacteria

a)

change nitrate back into nitrogen gas

b)

change nitrogen gas into nitrate

c)

absorb carbon dioxide in the soil

d)

release oxygen gas into the atmosphere

19.

What is the role of decomposing bacteria in the nitrogen cycle?

a)

change Nitrogen gas into Nitrate

b)

Return the nitrogen compounds to the soil

c)

Turn nitrogen into water

d)

Turn nitrate into nitrogen gas

20.

Burning fossil fuels releases this into the air

a)

nitrous oxide

b)

nitrate

c)

nitrogen gas (N2)

d)

methane

21.

How does fertilizer affect the nitrogen cycle- select all that apply

a)

the bacteria reproduce quicker

b)

cause nitrous oxide, a greenhouse gas, to enter the atmosphere and trap heat

c)

create large algae blooms in the water

d)

cause the nitrogen fixing bacteria in the soil to be less productive

22.

Organisms that need nitrogen to survive.

a)

only plants

b)

only animals

c)

only bacteria

d)

all living things

23.

What is the formula for atmospheric nitrogen?

a)

N

b)

N2

c)

NH3

d)

NO3

24.

Plants and animals cannot use nitrogen directly from the air.

a)

True

b)

False

25.

Oxygen is a gas produced by _ and used by _

a)

plants and animals

b)

photosynthesis and carbon dioxide

c)

animals and plants

d)

carbon dioxide and photosynthesis

26.
All of the carbon in existence is continually recycled in the carbon cycle
a)
True
b)
False
27.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
28.
The efficiency of energy transfer from a lower trophic level to the next highest level is roughly
a)
1%
b)
10%
c)
100%
d)
1000%
29.
Trophic levels are represented by 
a)
squares
b)
circles
c)
pyramids
d)
lines
30.
Which animal is the apex predator?
a)
hawk
b)
lizard
c)
snake
d)
grass
31.
In the energy pyramid here, how much of the energy in each level gets lost as heat or used by the organism for survival?
a)
80%
b)
90%
c)
10%
d)
20%
32.
Biomass refers to
a)
Chemical Energy
b)
Light Energy
c)
Rank in the feeding heirarchy
d)
Amount of living tissue in an ecosystem
33.
Which of the following would provide the most energy in an ecosystem?
a)
Producers
b)
Herbivore
c)
Omnivore
d)
Carnivore
34.
A wolf eats a rabbit, that just ate some berries.  What would you call the rabbit?
a)
Producer
b)
Omnivore
c)
Primary Consumer
d)
2nd order Heterotrph
35.

320,000 kCals of energy are found at the producer level in an energy pyramid. How much energy is available for consumers in the primary consumer level? (Hint: use the Rule of 10s)

a)

320,000 kCals

b)

32,000 kCals

c)

3,200 kCals

d)

320 kCals

36.

Kilocalories (kCal) is a measure of energy. If there are 1000 kCal available for the producers in trophic level #1, how much energy is available for the secondary consumers trophic level #3? (Hint: use the Rule of 10s)

a)

10 kCal

b)

1 kCal

c)

100 kCal

d)

1000 kCal

37.
Temperature, light, air, water, and soil are all  _____  parts of the environment
a)
alive
b)
biotic 
c)
abiotic
d)
living
38.
A living or once-living organisms in an ecosystem is a
a)
population
b)
biotic factor
c)
abiotic factor
d)
community
39.
Which of the fallowing has only abiotic factors?
a)
Sunlight, algae, and temperature
b)
Guppy, crab, oxygen
c)
Sunlight, soil, and weather
d)
Algae, temperature, and dog
40.

If all of the water dries up in a pond, the fish will-

a)

move into a new pond.

b)

swim faster.

c)

thrive.

d)

perish.

41.

When a population thrives, it means that-

a)

the number of organisms is decreasing.

b)

it is growing strong and reproducing.

c)

the number of organisms is increasing.

d)

the number of organisms stays the same.

42.

A fire destroys all of the trees and plants in the forest. How might this affect the birds in the area?

a)

The birds will plant seeds and grow new trees.

b)

The birds will have more food to eat.

c)

The birds will plant seeds and grow new trees.

d)

The birds will have no place to build their homes.

43.

A healthy environment, with no sudden changes will help

organisms to −

a)

die out.

b)

perish.

c)

move to new locations.

d)

thrive.

44.
Insecticides are sprayed over a large area in an effort to reduce the number of grasshoppers that are eating the corn plants. How will this change affect this food chain? 
a)
The number of grasshoppers will increase
b)
The number of lizards will increase
c)
The number of lizards and hawks will decrease
d)
The number of grasshoppers, lizards, and hawks will decrease
45.

There is less energy available in the winter than during the summer because ________ make less food in colder temperatures.

a)

consumers

b)

decomposers

c)

producers

d)

carnivores

46.

What is bioaccumulation or biomagnification?

a)

buildup of toxins in an organism

b)

the total mass/amount of organisms in a given area

c)

the number of different species in an area

47.

Which organism would have the most bioaccumulation?

a)

A because it consumes all the toxins from B, C, and D

b)

D because energy is lost as heat

c)

A because I'm not really reading what this says.

d)

D because it consumes all the toxins from B, C, and D

48.
Decomposition releases __________ into the soil
a)
hydrogen
b)
oxygen
c)
nitrogen
d)
helium
49.
Which of the following is NOT a "cycle"?
a)
Water
b)
Energy
c)
Nitrogen
d)
Phosphorus
50.

Trophic Levels show the

a)

what grade each organism has achieved in the ecosystem

b)

position that an organism occupies in a food chain - what it eats, and what eats it

c)

part of the triangle the organism likes the most

d)

elevation the organism likes to live in

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