Ecosystem Energy and Productivity Concepts

This video by Mr. Andersen explores energy flow in ecosystems, focusing on the role of producers, photosynthesis, and chemosynthesis. It explains how energy is converted and measured through productivity, and the significance of trophic levels. The video also discusses ecological pyramids, energy efficiency, and the role of decomposers in energy transfer.

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

• The Moon

• The Sun

• Volcanic Activity

• Ocean Currents

Which process allows plants to convert sunlight into chemical energy?

• Respiration

• Fermentation

• Photosynthesis

• Chemosynthesis

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

• Fermentation

• Respiration

• Decomposition

• Chemosynthesis

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

• Net is energy lost as heat, gross is energy stored

• Gross is energy lost as heat, net is energy stored

• Net includes respiration, gross does not

• Gross includes respiration, net does not

Which biome is known for having the highest productivity?

• Savanna

• Tropical Rainforest

• Tundra

• Desert

How does the productivity of cultivated land compare to natural ecosystems?

• Equal to deserts

• Lower than tropical rainforests

• Higher than all natural ecosystems

• Higher than coral reefs

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

• 50%

• 1%

• 10%

• 25%

What role do decomposers play in an ecosystem?

• They produce energy from sunlight

• They increase the energy efficiency of the ecosystem

• They recycle nutrients back into the ecosystem

• They consume primary producers

What is the main reason for energy loss at each trophic level?

• Energy is used for growth

• Energy is lost as heat

• Energy is converted to light

• Energy is stored in biomass

What is the term for the amount of biomass present at a given time in an ecosystem?

• Standing crop

• Net primary productivity

• Gross primary productivity

• Trophic level