Ecosystem Energy and Trophic Levels

The video explains how energy in ecosystems originates from the sun and is harnessed by producers through photosynthesis. It introduces trophic levels, highlighting the energy transfer and loss at each level, with only 10% of energy passed on. The concept of matter recycling is discussed, emphasizing the finite nature of matter and the role of decomposers in breaking down organic material to recycle nutrients back into the ecosystem.

What is the primary source of energy for ecosystems?

• The moon

• Ocean currents

• The sun

• Volcanic activity

Which organisms are responsible for converting solar energy into food?

• Decomposers

• Consumers

• Producers

• Predators

What term is used to describe the different feeding levels in an ecosystem?

• Energy levels

• Biomass levels

• Nutrient levels

• Trophic levels

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

• 90%

• 10%

• 25%

• 50%

Why is there a limit to the number of trophic levels in an ecosystem?

• Predators are too few

• Matter is finite

• Producers cannot support more levels

• Energy is lost at each level

What happens to most of the energy consumed by organisms?

• It is used for growth

• It is converted to matter

• It is stored as fat

• It is lost as heat

How is matter different from energy in an ecosystem?

• Matter and energy are both infinite

• Matter is lost, energy is recycled

• Matter is recycled, energy is lost

• Matter is infinite, energy is finite

What process allows plants to convert inorganic substances into organic matter?

• Fermentation

• Photosynthesis

• Decomposition

• Respiration

What role do decomposers play in the ecosystem?

• They produce energy

• They recycle nutrients

• They consume producers

• They create new matter

Which of the following is an example of a decomposer?

• Grasshopper

• Eagle

• Bacteria

• Tree