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7th Grade Science Exam

Total questions: 50

Worksheet time: 50mins

Name
Class
Date
1.

Biomes are:

a)

Ecosystems linked up to form larger areas with similar characteristics.

b)

Larger parts of land and water to make an ecosystem.

c)

Ecosystems linked up to form larger areas with different characteristics.

2.

Desert, Rain Forest and Prairie are examples of:

a)

Biomes

b)

Ecosystems

c)

Environments

3.

An organism that can make its own food is called a

a)

consumer

b)

producer

c)

decomposer

d)

scavenger

4.

In which process do producers use carbon from carbon dioxide to produce other carbon-containing molecules?

a)

nitrogen cycle

b)

precipitation

c)

water cycle

d)

photosynthesis

5.

A group of land ecosystems with similar climates and organisms is called a(n)

a)

energy pyramid

b)

climate

c)

biome

d)

food web

6.

Ponds and rivers are two types of

a)

marine ecosystems

b)

freshwater ecosystems

c)

rainforest biomes

d)

estuary ecosystems

7.

Which biome is extremely cold and dry?

a)

desert

b)

tundra

c)

grasslands

d)

mountains

8.

Bacteria and fungi are known as ____________________ because they break down the remains of organisms.

a)

producers

b)

first-level consumers

c)

second-level consumers

d)

decomposers

9.

Certain bacteria change nitrogen gas into a usable form in a process called _________________________.

a)

carbon cycle

b)

nitrogen cycle

c)

nitrogen fixation

d)

photosynthesis

10.

Which biome is typically populated by many grasses, along with a few shrubs and trees?

a)

rainforest

b)

grassland

c)

tundra

d)

desert

11.

What do we call the organisms that capture the energy of sunlight to make food

a)

producers

b)

consumers

c)

decomposers

d)

scavengers

12.

Which number represents a group of organisms that break down the wastes and remains of other organisms?

a)

1

b)

3

c)

5

d)

7

13.

Use the organisms listed from this ecosystem to construct a food chain. Begin your food chain with the producer.

a)

bear < fish < insect < grass

b)

grass > insect > fish > bear

c)

bear > fish > insect > grass

d)

grass < insect < fish < bear

14.
The term abiotic means;-
a)
Not a robot or robotic
b)
Living Things
c)
Water based environments
d)
Non-living things
15.
The term biotic means;-
a)
Not a robot or robotic
b)
Living Things
c)
Water based environments
d)
Non-living things
16.

Consumers that only eat other consumers

a)

carnivores

b)

omnivores

c)

herbivores

d)

tropovores

17.

Consumers that eat producers and consumers

a)

omnivores

b)

detritivores

c)

herbivores

d)

carnivores

18.

The beginning level of any food chain or energy pyramid is the

a)

producers

b)

decomposers

c)

scavengers

d)

primary consumers

19.

Which biome is Mississippi a part of?

a)

deciduous forest

b)

boreal forest

c)

temperate rain forest

d)

coniferous forest

20.

NItrogen-fixing ___________ help convert nitrogen gas found in the atmosphere into useful forms for plants.

a)

bacteria

b)

pathogens

c)

phagocytes

d)

antibodies

21.

What is an ecosystem?

a)

A large area of land

b)

A community of living things in an area

c)

A community of living and non-living things in an area

d)

A system used to improve the economy

22.
An ecosystem where water covers the soil or water is near the surface of the soil is called
a)
a desert
b)
an ocean
c)
an estuary
d)
a wetland
23.
What part of the water cycle does this picture show?
a)
condensation
b)
precipitation
c)
evaporation
24.
Snow, sleet, hail, and rain are all examples of  ________________. 
a)
evaporation
b)
condensation
c)
accumulation
d)
precipitation
25.
What is the water cycle?
a)
the 3 forms of water
b)
the movement of water on, above, or below the surface of the Earth
c)
when water melts
d)
when clouds form
26.
Which stage does the #2 show in the diagram?
a)
condensation
b)
evaporation
c)
precipitation
d)
run off
27.
Which stage does the #3 show in the diagram?
a)
condensation
b)
evaporation
c)
precipitation
d)
run off
28.
Which stage does the #3 show in the diagram?
a)
condensation
b)
evaporation
c)
precipitation
d)
run off
29.

What would happen if the Sun is removed from the water cycle?

a)

The water cycle would not include precipitation but would continue with groundwater flow.

b)

The water cycle would no longer occur because the Sun provides the energy for evaporation and transpiration.

c)

The water cycle would no longer occur because the Sun provides energy for the formation of clouds.

d)

The water cycle would not include evaporation and transpiration but would continue with condensation.

30.

Organisms that need nitrogen to survive.

a)

only plants

b)

only animals

c)

only bacteria

d)

all living things

31.

How is nitrogen "fixed" into a usable form for plants?

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria and lightning

d)

Through photosynthesis

32.

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

a)

Assimilation

b)

Fixation

c)

Ammonification

d)

Denitrification

33.

According to this diagram, plants use nitrogen to make _________________________

a)

bacteria

b)

animals

c)

proteins

d)

decomposers

34.
1. Oxygen exists in the atmosphere as which state of matter?
a)
solid
b)
liquid 
c)
gas
d)
plasma
35.
Carbon enters the living world through the process of _____.
a)
photosynthesis
b)
respiration
c)
combustion
d)
decomposition
36.
Burning fossil fuel has which effect in the carbon cycle?
a)
It removes carbon dioxide from the atmosphere.
b)
It puts carbon dioxide under the ground.
c)
It adds carbon dioxide to the atmosphere.
d)
It has no effect in the carbon cycle.
37.
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
38.
How is the burning of fossil fuels related to global warming?
a)
Magic
b)
Fuels are hot
c)
Greenhouse effect
d)
Photosynthesis
39.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
40.

If the plant population decreased, the amount of carbon in the atmosphere would _________.

a)

Stay the same

b)

Increase

c)

Decrease

41.

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

42.
carbon dioxide is a gas produced  by ________ and used by __________
a)
plants and animals 
b)
carbon and photosynthesis
c)
animals and plants 
d)
photosynthesis
43.

Which gas do plants release, that humans depend on for survival?

a)

Water

b)

Carbon Dioxide

c)

Oxygen

d)

Sugar

44.
These clouds are wispy or curly, white, thin & feather-like
a)
cumulus
b)
cumulonimbus
c)
cirrus
d)
stratus
45.
These clouds are very high in the sky.
a)
cumulus
b)
cumulonimbus
c)
cirrus
d)
stratus
46.
These clouds are made of ice crystals.
a)
cumulus
b)
cumulonimbus
c)
cirrus
d)
stratus
47.
These clouds are puffy and white and sometimes appear to have a flat bottom.
a)
cumulus
b)
cumulonimbus
c)
cirrus
d)
stratus
48.
Fog is this type of cloud when it is close to the ground
a)
cumulus
b)
cumulonimbus
c)
cirrus
d)
stratus
49.
Clouds form when...
a)
liquid water is heated and evaporates to become water vapor in the atmosphere.
b)
water vapor in the atmosphere cools and condenses becoming water droplets in the atmosphere
c)
water droplets float upwards and gather together in the atmosphere to form a cloud.
50.

What are the characteristics of a alto-cumulus cloud?

a)

small, white and puffy, middle level cloud

b)

low, puffy, produce rain

c)

high, looks like cotton balls bunched together

d)

fluffy clouds, flat on the bottom

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