LEESON 3: The Oxygen Cycle

LEESON 3: The Oxygen Cycle

by yamna Alketbi

​Cycling of Matter

• ​The carbon cycle

• ​The water cycle

• ​The nitrogen cycle

• ​The oxygen

​The Oxygen Cycle

Multiple Choice

Oxygen is a living element that humans and animals require to live. 

• True

• False

Multiple Select

Oxygen is part of many substances such as:

• Carbon dioxide

  CO2

• Water

  H2O

• Ozon

  O3

• Nitrogen

  N2

Multiple Choice

The primary source of oxygen in Earth's is ______

• water cycle

• Carbon cycle

• Photosynthesis

• Cellular respiration

Multiple Choice

Unicellular Organisms  ( phytoplankton) in water relase more than -------of the oxygen in Earth's atmosphere

• 50%

• 90%

• 10%

• 100%

Multiple Choice

Plants use _____________ to make their own food during photosynthesis.

• water

• energy from the Sun

• CO2

• water, energy from Sun, CO2

Multiple Choice

What is the process of plants taking in carbon dioxide and releasing oxygen called?

• Respiration

• Photosynthesis

• Produce

• Breathing

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Multiple Choice

A gas produced by animals during respiration that plants use for photosynthesis.

• Oxygen

• Carbon dioxide

• Water vapor

• Nitrogen

Multiple Choice

Which statement is an example of how plants and animals depend on each other?

• animals provide food for plants

• animals provide water for plants

• animals provide oxygen for plants

• animals provide carbon dioxide for plants

Multiple Choice

Animals and plants use substances that cycle through the environment.  Which substance is needed by plants to survive and is released into the environment by animals?

• oxygen

• sugar

• carbon dioxide

• salt

Multiple Choice

Animals use oxygen for _____________.

• breathing

• creating food

• making glucose

• transpiration

Multiple Choice

What produces oxygen?

• People and animals

• All plants

• Only green plants

• All living organisms

Multiple Choice

A gas that is produced by plants during photosynthesis that animals use for respiration.

• Carbon dioxide

• Oxygen

• Water vapor

• Toots

Multiple Choice

Animals obtain the nitrogen they need directly from the

• soil in their habitat

• plants they eat

• air they breathe

• bacteria living within them

  HIDE ANSWER

The End​

Thank you​