Energy Flow in Ecosystems

What is the primary source of energy for almost every ecosystem?

• The sun

• Producers

• Consumers

• Decomposers

Which organisms occupy the first trophic level in a food web?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers

What is the 10 percent rule in the context of energy flow in ecosystems?

• Only 10 percent of energy is transferred to the next trophic level

• 10 percent of energy is lost at each trophic level

• 10 percent of organisms survive at each trophic level

• 10 percent of energy is used by decomposers

Which of the following are primary consumers in a food web?

• Herbivores and omnivores

• Carnivores

• Decomposers

• Producers

What role do decomposers play in the energy flow within ecosystems?

• They break down dead organisms and recycle nutrients

• They produce their own food through photosynthesis

• They consume primary consumers

• They occupy the first trophic level