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6th Grade- Unit 8
Test Description: Natural cycles
Instructions: Answer all questions to get your test result.
1) Carbon enters the living parts of an ecosystem though the form of
A
solid
B
plasma
C
liquid
D
gas
2) _____________ is an element found in every living thing on Earth
A
nitrogen
B
carbon
C
oxygen
D
hydrogen
3) After an animal eats a plant, the animal then breaks down the carbon compounds in a process called
A
photosynthesis
B
metabolism
C
carbon breakdown
D
respiration
4) The remains of plants and animals that have been slowly decaying for millions of years turn into something called
A
rare fossils
B
fossil fuels
C
fossil oils
D
skeletons
5) Plants are able to use the energy of sunlight to convert carbon dioxide and water into carbohydrates and _______ in photosynthesis.
A
hydrogen
B
oxygen
C
helium
D
carbon
6) plants breathe in _______________ and breathe out oxygen
A
helium
B
oxygen
C
carbon dioxide
D
hydrogen
7) The movement of nitrogen through the ecosystem is called the
A
oxygen cycle
B
hydrogen cycle
C
nitrogen cycle
D
water cycle
8) The algae in the oceans and other water bodies replace about _____ % of all oxygen used on our planet
A
50
B
100
C
90
D
80
9) Oxygen in the water is known as
A
oxygen water
B
oxygen gas
C
dissolved oxygen
D
dissolved water
10) Oxygen is created in plants and used by
A
animals and plants
B
plants
C
none of these
D
animals
11) Nitrogen makes up about ___% of the air in the atmosphere.
A
78
B
98
C
50
D
68
12) The process by which bacteria turn nitrogen gas into nitrogen, which plants can use, is called
A
nitrogen converting
B
nitrogen changing
C
nitrogen fixation
D
nitrogen replacing
13) Plants are involved in one half, and animals in the other half of the
A
carbon cycle
B
oxygen cycle
C
water cycle
D
nitrogen cycle
14) Oceans also play a key role in the
A
carbon cycle
B
nitrogen cycle
C
oxygen cycle
D
hydrogen cycle
15) bacteria play an important role in the
A
nitrogen cycle
B
water cycle
C
carbon cycle
D
oxygen cycle
16) Animals get the nitrogen they need by eating plants or other animals that contain nitrogen
A
false
B
true
17) A drought in a grassland ecosystem would not affect the wolves because they do not need plants to survive
A
false
B
true
18) Without bacteria, nitrogen could still enter living things or be returned to the environment
A
true
B
false
19) Nitrogen in the atmosphere is already in the form that plants and animals can use.
A
TRUE
B
FALSE
*select an answer for all questions
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