The Cycle of Energy in Plants (ReadWorks article)

What are the two processes responsible for the exchange of oxygen and carbon dioxide between living organisms and the environment?

• Evaporation and condensation

• Photosynthesis and cellular respiration

• Digestion and circulation

• Inhalation and exhalation

Where does photosynthesis take place?

• In the atmosphere

• In bacteria and viruses

• In plants and algae

• In animals and fungi

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What is the role of chlorophyll in photosynthesis?

• It releases oxygen

• It absorbs the sun’s energy

• It absorbs carbon dioxide

• It produces water

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What are stomata?

• Energy from sunlight

• Organelles in plant cells

• Tiny pores on the surface of plant leaves

• A type of sugar

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During photosynthesis, water is oxidized, meaning it:

• Loses electrons

• Gains electrons

• Turns into oxygen

• Absorbs sunlight

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What happens to glucose during cellular respiration?

• It reacts with oxygen to produce energy

• It is stored for later use

• It is expelled as a waste product

• It is converted into sunlight

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What can affect the rates of photosynthesis and cellular respiration?

• The type of soil

• The age of the plant

• The color of the plant

• Temperature and rainfall

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Why is the cycle of photosynthesis and cellular respiration important for our world?

• It creates sunlight

• It produces water

• It maintains the oxygen content of the Earth’s atmosphere

• It increases carbon dioxide in the atmosphere

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What happens to plants at extremely high or low temperatures?

• They absorb more sunlight

• They grow faster

• They produce more oxygen

• They may experience damage to their cells

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What is the consequence of a plant lacking water?

• The rate of photosynthesis increases

• Stomata open wider

• Chlorophyll production increases

• The rate of photosynthesis decreases

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