Which best describes an ecosystem?

• Populations interacting

• All biotic factors interacting

• Inter-species relationships

• All biotic and abiotic factors

Choose the correct sequence for energy flow within an ecosystem

• Herbivores → producers → carnivores → scavengers

• Producers → herbivores → carnivores → scavengers

• Producers → carnivores → herbivores → carnivores

• Scavengers → producers → herbivores → carnivores

• Carnivores → scavengers → producers → herbivores

Which is a product of photosynthesis?

• I. Glucose

• II. Carbon dioxide

• III. Water

• I and II

Which of the following are needed for photosynthesis?

• Water, solar energy, and carbon dioxide

• Water, solar energy, and glucose

• Carbon dioxide, solar energy, and glucose

• Oxygen, water, and solar energy

• Oxygen and glucose

Which group of organisms performs photosynthesis?

• Autotrophs

• Scavengers

• Heterotrophs

• Consumers

Organisms that eat dead or decaying matter are called

• tertiary consumers.

• primary consumers.

• scavengers.

• heterotrophs.

Which group of organisms performs cellular respiration?

• I. Autotrophs

• II. Heterotrophs

• III. Decomposers

• I, II, and III

What are the physical products of cellular respiration?

• Oxygen and carbon dioxide

• Nitrogen and carbon

• Glucose and oxygen

• Water and carbon dioxide

• Glucose and water

Which of the following shows the complex interactions among species within an ecosystem?

• Food chain

• Food web

• Food pyramid

• Energy pyramid

• Trophic level diagram

Approximately how much of the potential energy available from the Sun’s rays hitting Earth is used in photosynthesis?

• 1 percent

• 10 percent

• 25 percent

• 50 percent

• 90 percent