Ecosystem Energy and Productivity Concepts

This video by Mr. Andersen covers energy flow in ecosystems, focusing on the role of producers, photosynthesis, and chemosynthesis. It explains how energy is measured through productivity, both gross and net, and discusses the concept of ecological pyramids to illustrate energy efficiency across trophic levels. The video also highlights the importance of decomposers and compares productivity across different biomes.

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

• The Moon

• The Sun

• Nuclear Reactions

• Geothermal Vents

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

• Chemosynthesis

• Photosynthesis

• Respiration

• Fermentation

Which of the following is a chemical used in chemosynthesis?

• Carbon Dioxide

• Oxygen

• Hydrogen Sulfide

• Nitrogen

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

• Gross is the total energy converted; net is after respiration.

• Gross is energy from consumers; net is from producers.

• Gross is the energy after respiration; net is before.

• Gross is energy from chemicals; net is from sunlight.

Which biome is known for having high productivity?

• Desert

• Tundra

• Savanna

• Tropical Rainforest

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

• 90%

• 50%

• 10%

• 1%

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

• Secondary Consumers

• Primary Consumers

• Tertiary Consumers

• Producers

What role do decomposers play in an ecosystem?

• They recycle nutrients back into the ecosystem.

• They compete with primary consumers.

• They consume primary producers.

• They produce energy from sunlight.

How does the energy efficiency of an ecosystem typically range?

• 1% to 5%

• 5% to 20%

• 20% to 50%

• 50% to 90%

What is the term for the amount of biomass present at a specific time?

• Standing Crop

• Gross Primary Productivity

• Trophic Level

• Net Primary Productivity