Ecosystem Energy and Trophic Levels

The video explores how energy flows and matter is recycled in ecosystems. It begins with the sun as the primary energy source, which is harnessed by primary producers like plants through photosynthesis. Energy is transferred through the ecosystem via consumers, with only a fraction retained at each trophic level. Decomposers play a crucial role in recycling matter, breaking down dead organisms and waste, returning nutrients to the ecosystem. The video emphasizes the conservation of energy and matter, highlighting their continuous cycle within ecosystems.

What is the primary source of energy for most ecosystems?

• Wind energy

• Moonlight

• The sun

• Geothermal energy

What process do primary producers use to store energy?

• Respiration

• Photosynthesis

• Fermentation

• Decomposition

What term is used to describe organisms that consume primary producers?

• Primary consumers

• Secondary consumers

• Decomposers

• Tertiary consumers

Approximately what percentage of energy is transferred from one trophic level to the next?

• 50%

• 25%

• 10%

• 90%

Which of the following is a secondary consumer?

• Decomposer

• Fox

• Rabbit

• Grass

What is the role of decomposers in an ecosystem?

• To store energy in the form of fat

• To consume primary producers

• To break down dead organisms and recycle nutrients

• To produce energy from sunlight

What is an apex predator?

• A decomposer

• A primary producer

• An organism that is at the top of the food chain

• An organism that only eats plants

How is matter recycled in an ecosystem?

• It is constantly reused and transformed

• It is destroyed after use

• It is created anew by plants

• It is only used once

Where do the atoms in our bodies originally come from?

• The ocean

• The soil

• The atmosphere

• Stars

What happens to energy as it flows through an ecosystem?

• It is lost as heat at each step

• It increases at each trophic level

• It is completely conserved without any loss

• It is stored indefinitely