Unit 3: Functioning Ecosystems.1

What is the ultimate source of energy for organisms found in an ecosystem?

• Chemical energy

• Solar energy

• Thermal energy

• Kinetic energy

What process converts solar energy into chemical energy in plants?

• Photosynthesis

• Fermentation

• Transpiration

• Respiration

What percentage of solar energy is approximately absorbed by plants?

• 0.1%

• 1%

• 5%

• 10%

Which of the following represents the flow of energy from one living organism to the next?

• Food web

• Biogeochemical cycle

• Food chain

• Energy pyramid

In a terrestrial ecosystem, which of the following is typically the primary producer?

• Fungi

• Bacteria

• Green plants

• Zooplankton

What term describes the amount of fixed energy in organic compounds?

• Photosynthetic efficiency

• Trophic level

• Biomass

• Productivity

Which of the following organisms are considered autotrophs?

• Decomposers

• Producers

• Carnivores

• Herbivores

What is the role of decomposers in an ecosystem?

• Consume producers

• Produce food

• Transfer energy to higher trophic levels

• Break down dead organisms

Which of the following is a first order consumer?

• Carnivore

• Herbivore

• Omnivore

• Decomposer

In an aquatic ecosystem, which organism is typically the primary producer?

• Zooplankton

• Phytoplankton

• Small fish

• Bigger fish