Unit 7

One of the largest cypress trees in Florida has a tree trunk with a diameter of about 3.5 m. What is the source of most of the carbon in the cypress tree’s trunk?

• The carbon dioxide molecules the tree absorbed from the atmosphere.

• The carbon created by the tree during photosynthesis

• The carbon stored in tree seeds.

• The nutrients containing carbon that the tree absorbed from the soil.

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There is a connection between photosynthesis and cellular respiration. The products from one provide the raw materials for the other. This image shows the relationship between the two processes.What products of photosynthesis are starting material for cellular respiration?

• Glucose and oxygen

• Heat energy and ATP

• Carbon dioxide and water

• Light energy and chlorophyll

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A freshwater marsh is a type of ecosystem. Grasses, fish, wading birds, frogs, and alligators live together in freshwater marshes. Pieces of decaying material sink to the bottom of the marsh. In which of these places can carbon be found in the marsh?

• in the atmosphere and water only

• In living things only

• In living things and decaying materials

• n the atmosphere, water, living things, and decaying materials

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Green plants produce their own food during photosynthesis. This image shows the process

of photosynthesis.

Which of these substances is also a product of photosynthesis?

• carbon dioxide

• chlorophyll

• oxygen

• water

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Jamal is running a race this afternoon. He eats a big breakfast to make sure that he can reach the finish line because food provides the energy his cells need to complete any activity. What form of energy is stored in food?

• chemical energy

• kinetic energy

• light energy

• mechanical energy

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Plants perform photosynthesis and respiration. Dead plants are broken down and become part of the soil. Which of the following matter do plants help to cycle through ecosystems?

• carbon only

• carbon and oxygen only

• carbon, oxygen, and nitrogen only

• carbon, oxygen, nitrogen, and water

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Kristine exercises regularly. The process of cellular respiration makes it possible for Kristine to run on the treadmill and to lift weights. What do her cells do during cellular respiration?

• Convert kinetic energy into chemical energy

• Absorb light energy through the chlorophyll in their chloroplasts

• Combine water and carbon dioxide to produce oxygen and glucose

• Break down food molecules to release energy in the form of ATP

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There is a relationship between breathing and cellular respiration. Breathing involves taking in oxygen and releasing carbon dioxide. How does the oxygen affect the process of cellular respiration?

• Oxygen and ATP combine to produce energy in the form of carbon dioxide.

• Oxygen and glucose combine to produce energy in the form of ATP molecules

• Oxygen and hydrogen combine to produce energy in the form of ATP molecules.

• Oxygen and carbon dioxide combine to produce energy in the form of ATP molecules.

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Worms break down dead plants in the soil to release nutrients. Which property of nutrients shows that they are matter?

• Nutrients are warm.

• Nutrients can do work.

• Nutrients contain energy.

• Nutrients have mass.

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A coral reef is damaged during a hurricane. The waves and currents move broken pieces of coral onto the beach. What would you claim happened to the matter in the broken pieces of coral?

• It is still part of the coral reef ecosystem.

• It was removed from the environment.

• It became part of the beach ecosystem.

• It was lost due to the energy in the waves.

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