Energy Flow in Ecosystems

What are the two primary methods by which producers convert external energy into usable food energy?

• Respiration and Fermentation

• Photosynthesis and Chemosynthesis

• Digestion and Absorption

• Combustion and Oxidation

Which of the following are the primary products of photosynthesis?

• Carbon dioxide and water

• Glucose and oxygen

• Energy and carbon dioxide

• Water and oxygen

What percentage of the sun's energy that reaches producers is typically converted into gross primary productivity (GPP)?

• 99%

• 60%

• 40%

• 1%

What is the approximate percentage of energy transferred from one trophic level to the next in an ecosystem?

• 1%

• 10%

• 50%

• 90%