4.2 Energy Flows Through an Ecosystem

Identify the principal role of cellular respiration.

• To convert solar energy into the chemical energy of sugars

• To convert kinetic energy into the chemical energy of sugars

• To convert the chemical energy of sugars into the chemical energy that fuels life's processes

• To convert the chemical energy of sugars into heat to maintain an elevated body temperature

Identify the principal role of photosynthesis.

• To convert solar energy into the chemical energy of sugars

• To convert kinetic energy into the chemical energy of sugars

• To convert the chemical energy of sugars into the chemical energy that fuels life's processes

• To convert the chemical energy of sugars into heat to maintain an elevated body temperature

Select the ultimate source of energy for nearly every organism on this planet.

• Plants

• ATP molecules

• The sun

• Sugars

Which processes can be carried out by producers?

• Only photosynthesis

• Only cellular respiration

• Both photosynthesis and cellular respiration

• Neither photosynthesis nor cellular respiration

Which processes can be carried out by consumers?

• Only photosynthesis

• Only cellular respiration

• Both photosynthesis and cellular respiration

• Neither photosynthesis nor cellular respiration

Heat is released in both photosynthesis and cellular respiration as a byproduct.

• True, both processes release heat

• False, only photosynthesis releases heat as a byproduct

• False, only cellular respiration releases heat as a byproduct

• False, neither photosynthesis nor respiration release heat as a byproduct

The chemical reactions of photosynthesis occur in which cellular organelle?

• Chloroplasts

• Nucleus

• Mitochondria

• Ribosomes

Which of the following organisms is a producer?

• A lion

• A human

• A mushroom

• A oak tree

What is the role of chloroplasts in animals?

• To produce ATP

• To carry out photosynthesis

• To produce sugars

• There is no role, as animals do not have chloroplasts

Choose the best explanation as to why both consumers and producers perform cellular respiration.

• Although they may obtain their sugars in different ways, both consumers and producers rely on cellular respiration to make ATP.

• Both consumers and producers perform cellular respiration to produce the sugars needed to fuel the energy of life.

• Both consumers and producers perform cellular respiration to produce the oxygen necessary to sustain life.

• Both consumers and producers perform cellular respiration to produce the heat necessary to sustain life.