# Ecological Pyramids Quiz

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## 10 Questions

4000 kJ

90%

Grass

40 kJ

### What trophic level do Thrust birds occupy in the food chain?

Tertiary consumer

### What is the term used to refer to the total quantity of living organisms of all the species in a community?

Community biomass

### In an ecological pyramid, which level typically contains the least amount of energy?

Tertiary consumers

Dry mass

6 thrust birds

## Study Notes

### Ecological Pyramids

#### Types of Ecological Pyramids

• Pyramid of Numbers: represents the number of organisms at each trophic level
• Pyramid of Biomass: represents the total mass of living organisms at each trophic level (usually measured as dry mass)
• Pyramid of Energy: represents the amount of energy available at each trophic level

### Characteristics of Ecological Pyramids

• 10% of energy is passed on from one trophic level to the next, while 90% is used for metabolism and to keep the organism alive
• Pyramid of Numbers can have three possible shapes: most common, inverted, and another
• Pyramid of Biomass and Energy are typically narrower at the top and wider at the base

### Example Food Chain

• Grass → grubs → thrust birds → owl
• Calculations for each trophic level:
• Total number of owls: 2
• Total number of thrust birds: 4 (2 owls x 2)
• Total number of grubs: 400 (4 thrust birds x 100)
• Total number of grass blades: 60,000 (400 grubs x 150)

### Energy Pyramid

• Energy available at each trophic level:
• Grass: 4000 kJ
• Grubs: 400 kJ (10% of 4000 kJ)
• Thrust birds: 40 kJ (10% of 400 kJ)
• Owls: 4 kJ (10% of 40 kJ)

### Biomass Pyramid

• Biomass at each trophic level:
• Grass: 0.05 g
• Grubs: 5 g
• Thrust birds: 300 g
• Owls: 500 g

Test your knowledge on ecological pyramids, including biomass, dry mass, and pyramid of numbers. Learn about the different shapes of pyramids and their significance in ecology.

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