Energy Flow and Ecosystem Productivity

Mr. Andersen explains energy flow in ecosystems, focusing on the role of producers, photosynthesis, and chemosynthesis. He discusses productivity, energy transfer efficiency, and ecological pyramids, highlighting the importance of understanding energy conversion and biomass in different biomes.

What is the primary source of energy for ecosystems on Earth?

• Ocean Currents

• The Sun

• The Moon

• Volcanic Activity

Which process do plants use to convert sunlight into chemical energy?

• Fermentation

• Chemosynthesis

• Respiration

• Photosynthesis

Which process is similar to photosynthesis but uses chemical energy instead of sunlight?

• Chemosynthesis

• Fermentation

• Decomposition

• Respiration

What is the main difference between gross primary productivity and net primary productivity?

• Net is always higher than gross

• Gross is always higher than net

• Net includes respiration, gross does not

• Gross includes respiration, net does not

Which biome is known for having the highest productivity?

• Savanna

• Tundra

• Tropical Rainforest

• Desert

What is the main reason for seasonal changes in net primary productivity?

• Animal migration

• Ocean currents

• Volcanic eruptions

• Changes in sunlight

What percentage of energy typically transfers from one trophic level to the next?

• 1%

• 10%

• 50%

• 90%

What role do decomposers play in an ecosystem?

• They recycle nutrients

• They store energy

• They produce energy

• They consume primary producers

In an ecological pyramid, which level contains the most energy?

• Tertiary consumers

• Secondary consumers

• Producers

• Primary consumers

How is biomass different from energy measurement in an ecological pyramid?

• Biomass measures material at a point in time

• Biomass measures energy over time

• Biomass includes decomposers

• Biomass is always higher than energy