Ecological Efficiency and Energy Flow

This video by Mr. Andersen explores energy flow in ecosystems, emphasizing the sun as the primary energy source. It explains photosynthesis and chemosynthesis, detailing how energy is converted and transferred through trophic levels. The video discusses productivity, both gross and net, and introduces ecological pyramids to illustrate energy loss at each level. It also covers ecological efficiency and biomass, highlighting the importance of measuring energy and material in ecosystems.

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

• Volcanoes

• The Sun

• Wind

• The Moon

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

• Respiration

• Photosynthesis

• Chemosynthesis

• Fermentation

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

• Tropical Rainforest

• Tundra

• Desert

How does seasonal change affect net primary productivity?

• It varies with sunlight availability

• It increases in winter

• It decreases in summer

• It remains constant throughout the year

In an ecological pyramid, what percentage of energy typically transfers from one trophic level to the next?

• 100%

• 10%

• 1%

• 50%

What role do decomposers play in an ecosystem?

• They store energy

• They recycle nutrients

• They consume primary producers

• They produce energy

Which of the following is a measure of the amount of living material in an ecosystem?

• Respiration

• Productivity

• Energy flow

• Biomass

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

• Energy is used for growth

• Energy is stored indefinitely

• Energy is converted to heat

• Energy is destroyed

Which of the following best describes the concept of ecological efficiency?

• The energy stored in producers

• The total energy produced by an ecosystem

• The energy transferred between trophic levels

• The energy lost to the environment