Energy Pyramid (10% Rule)

What organisms are at the bottom of an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

How much energy is passed on to each trophic level in an energy pyramid?

• 10%
• 90%
• 50%
• 80%

Which organisms have the most available energy in an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

Where do crickets get their energy?

• Cattails
• Marsh Grass
• Grasshoppers
• Shrews

Which organisms in the diagram have the largest total energy to give to other organisms?

• Cattails and Marsh Grass
• Hawks and Snakes
• Crickets and Grasshoppers
• Shrews and Frogs

If 25,000 kg of vegetation is planted in this ecosystem, how would the lion population change?

• Decrease by 2,500 kg
• Decrease by 25,000 kg
• Increase by 250 kg
• Increase by 250,000

In the energy pyramid here, which organisms have the most energy available? 

• Producers
• Carnivores
• Herbivores
• Top Predator

Use this food chain to answer: Sun->Grass->Grasshopper->Lizard->Eagle

If grass has 1000 units of energy, what is the amount of energy the primary consumer gets?

• 10

• 100

• 1

• 1000

How is energy transferred in an energy pyramid?

• 10% to the level above, 90% lost as heat

• 90% to the level above, 10% lost as heat

• 100% to the level above, 90% lost as heat

• 90% to the level above, 90% lost as heat

What is the 10% rule?

• If you start with 3000 units of energy at the bottom you will have 30000 units at the top
• as you go up the pyramid 10% of the energy is left behind at each level
• the higher you go the more energy is present
• as you go from one level to the next, only 10% of the energy is transferred to the next level