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7th Grade #4: Ecosystems

Total questions: 48

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

Biotic factors are

a)

Living

b)

nonliving

2.

Abiotic factors

a)

living

b)

nonliving

3.

Water would be an example of:

a)

Biotic

b)

abiotic

4.

Choose all the abiotic factors listed

a)

water

b)

mates

c)

space

d)

temperature

e)

predators

5.

Choose all the biotic factors listed

a)

sunlight

b)

food

c)

predators

d)

disease

e)

water

6.

A dead squirrel is an abiotic factor because it is not living anymore.

a)

True

b)

False

7.

The factors that limit the size of a population are:

a)

Ecos factor

b)

carrying capacity

c)

limiting factor

d)

abiotic number

8.

An abiotic factor that limits a population size would be?

a)

Food

b)

predators

c)

space

d)

disease

9.
A producer?
a)
Eats other plants and animals
b)
Makes its own food
c)
Eats dead plants or animals
d)
Makes toys for kids
10.
A consumer?
a)
Makes its own food
b)
Eats dead plants and animals
c)
Eats plants and other animals for energy
d)
Buys toys for kids
11.
A decomposer?
a)
Eats dead plants or animals and breaks down to put nutrients in the soil
b)
Eats plants or other animals for food
c)
Makes its own food
d)
Machine that gathers trash
12.
This organism traps its prey in a web, stings it, paralyzes it, and sometimes saves it to eat later. Is it a.....
a)
Producer
b)
Consumer
c)
Decomposer
13.
This organism draws its nutrients from dead organisms as it releases enzymes to cause the organisms to break down and break apart. Is it a...
a)
Producer
b)
Consumer
c)
Decomposer
14.
Frog. Is it a....
a)
Producer
b)
Conusmer
c)
Decomposer
15.
Earthworm. Is it a...
a)
Producer
b)
Consumer
c)
Decomposer
16.
Fungi. Is it a...
a)
Producer
b)
Consumer
c)
Decomposer
17.
Pine Tree. Is it a...
a)
Producer
b)
Consumer
c)
Decomposer
18.
Squirrel 
a)
Producer
b)
Consumer 
c)
Decomposer 
19.
Flower 
a)
Producer
b)
Consumer 
c)
Decomposer 
20.
Human 
a)
Producer
b)
Consumer
c)
Decomposer 
21.
Bacteria 
a)
Producer
b)
Consumer 
c)
Decomposer 
22.
The arrows in a food chain or web represents what?
a)
They point to the organism that is being eaten.
b)
It shows how sunlight flows within an ecosystem.
c)
They show what direction the energy is flowing between organisms. 
d)
They represent how water is transferred within a habitat.
23.
What does a food web represent?
a)
All connections of energy flow throughout all organisms in a habitat.
b)
The specific ways that mutualism is carried out.
c)
A single pathway or energy flow between organisms. 
d)
How carnivores get their food. 
24.

Which organisms have access to the least amount of energy?

a)

producers (grass/tree)

b)

first level consumers (rabbit, grasshopper, deer)

c)

second level consumers (rodent, robin, fox) 

d)

third level consumers (birds of prey)

25.
The owl receives energy from which organisms?
a)
grasshopper and mouse
b)
mouse and rabbit
c)
rabbit and butterfly
d)
butterfly and frog
26.
Name the producers in this food web.
a)
seagull and fish
b)
penguin and crab
c)
phytoplankton and seaweed
d)
seaweed and zooplankton
27.
How many predators does the squid have?
a)
1
b)
2
c)
3
d)
4
28.
Which organism do the owl and the weasel compete for in the food web?
a)
Hawk
b)
Spider
c)
Grasshopper
d)
Shrew
29.

What is the bottom layer of the an energy pyramid?

a)

producer

b)

tertiary consumer

c)

Secondary consumer

d)

primary consumer

30.

Does the energy get lower or higher when it is transferred through each animal?

a)

It gets higher

b)

It gets lower

31.
A food pyramid represent the relative amount of energy in trophic levels. Which of the following correctly shows a food pyramid?
a)
A
b)
B
c)
C
d)
D
32.
In the energy pyramid below, which organism has the least amount of energy available?
a)
Producers
b)
Herbivores
c)
Carnivores
d)
Top Predator
33.

Which activities would increase carbon dioxide in the atmosphere?

a)

plants doing photosynthesis

b)

deer dying

c)

cutting down trees

d)

driving a car

e)

eating a pizza

34.

As a part of the water cycle, water from Earth's surface enters the clouds and finally falls back to the ground in the form of rain. What is the correct sequence of processes water undergoes?

a)

Evaporation, Condensation, Precipitation

b)

Precipitation, Condensation, Evaporation

c)

Condensation, Evaporation, Precipitation

d)

Evaporation, Precipitation, Condensation

35.

A student draws a model to represent the precesses involved in the water cycle, as shown. To which process is the formation of clouds related?

a)

Condensation

b)

Evaporation

c)

Freezing

d)

Melting

36.

On Earth, what process generates most of the water vapor?

a)

Condensation

b)

Evaporation

c)

Precipitation

d)

Transpiration

37.
What is it called when plants give off water vapor as a waste product?
a)
condensation
b)
evaporation
c)
sublimation
d)
transpiration
38.
What is the process during which water changes from a liquid to a gas as it heats up?
a)
Condensation
b)
Runoff
c)
Precipitation
d)
Evaporation
39.
What is the process during which water cools and turns from a gas to a liquid?
a)
Condensation
b)
Runoff
c)
Precipitation
d)
Evaporation
40.
What step of the water cycle occurs when clouds become too heavy? 
a)
Condensation
b)
Runoff
c)
Precipitation
d)
Evaporation
41.
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
42.
Plants and animals cannot use nitrogen directly from the air.
a)
True
b)
False
43.
Based on this diagram, which of the following can you infer is the chemical formula for gaseous nitrogen?
a)
N
b)
N2
c)
N3
d)
N4
44.

Why do farmers need to add a nitrogen based fertilizer?

a)

to "fix" the free nitrogen so it becomes usable

b)

there are no fertilizers on a farm

c)

beacteria release all the nitrogen into the air

d)

nitrogen can only be "fixed" from rain water

45.

Which describes the relationship between plants and animals in the carbon cycle?

a)

Plants produce and release oxygen that animals need

b)

Plants produce and release carbon dioxide that animals need

c)

Animals produce and release oxygen that plants need

d)

Animals produce oxygen that plants turn into carbon dioxide

46.

Which is a true statement?

a)

Humans depend on oxygen, plants depend on carbon dioxide

b)

Plants produce carbon dioxide

c)

Humans depend on carbon dioxide, plants depend on oxygen

d)

Humans don't depend on plants for the air they need

47.

Carbon atoms cannot be created or destroyed

a)

True

b)

False

c)

Not enough information to answer

48.

What is true about the carbon cycle?

a)

Producers take in carbon dioxide from the air

b)

producers break down carbon dioxide and release the oxygen as waste

c)

consumers eat plants, which contains carbon

d)

consumers release carbon dioxide as a waste when they breathe out

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