6th Grade- Unit 8 Question Preview (ID: 34861)


Natural Cycles.

Oxygen is created in plants and used by
a) animals
b) plants
c) animals and plants
d) none of these

Oxygen in the water is known as
a) dissolved oxygen
b) oxygen gas
c) oxygen water
d) dissolved water

The movement of nitrogen through the ecosystem is called the
a) water cycle
b) hydrogen cycle
c) oxygen cycle
d) nitrogen cycle

The algae in the oceans and other water bodies replace about _____ % of all oxygen used on our planet
a) 80
b) 90
c) 100
d) 50

plants breathe in _______________ and breathe out oxygen
a) oxygen
b) helium
c) hydrogen
d) carbon dioxide

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) carbon
d) helium

The remains of plants and animals that have been slowly decaying for millions of years turn into something called
a) fossil fuels
b) fossil oils
c) skeletons
d) rare fossils

_____________ is an element found in every living thing on Earth
a) hydrogen
b) oxygen
c) carbon
d) nitrogen

After an animal eats a plant, the animal then breaks down the carbon compounds in a process called
a) photosynthesis
b) respiration
c) metabolism
d) carbon breakdown

Carbon enters the living parts of an ecosystem though the form of
a) solid
b) liquid
c) gas
d) plasma

Nitrogen makes up about ___% of the air in the atmosphere.
a) 78
b) 68
c) 50
d) 98

The process by which bacteria turn nitrogen gas into nitrogen, which plants can use, is called
a) nitrogen changing
b) nitrogen fixation
c) nitrogen converting
d) nitrogen replacing

Plants are involved in one half, and animals in the other half of the
a) water cycle
b) carbon cycle
c) oxygen cycle
d) nitrogen cycle

Oceans also play a key role in the
a) carbon cycle
b) oxygen cycle
c) nitrogen cycle
d) hydrogen cycle

bacteria play an important role in the
a) carbon cycle
b) oxygen cycle
c) nitrogen cycle
d) water cycle

Animals get the nitrogen they need by eating plants or other animals that contain nitrogen
a) true
b) false
c)
d)

A drought in a grassland ecosystem would not affect the wolves because they do not need plants to survive
a) true
b) false
c)
d)

Without bacteria, nitrogen could still enter living things or be returned to the environment
a) true
b) false
c)
d)

Nitrogen in the atmosphere is already in the form that plants and animals can use.
a) TRUE
b) FALSE
c)
d)

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