Energy Pyramid Worksheets - Free Printables - Free Printable

Let's solve the Energy Pyramid Worksheet step by step.

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🔍 Understanding the Energy Pyramid

An energy pyramid shows how energy flows through an ecosystem, from producers to consumers. Each level is called a trophic level, and energy decreases as you move up because only about 10% of energy is transferred from one level to the next (this is known as the 10% Rule).

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🌞 Energy Source

At the base of the pyramid, sunlight provides the original energy source for producers.

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🧩 Trophic Levels (from bottom to top):

#### 1. Producers (First Trophic Level)
- Organisms that make their own food via photosynthesis.
- Examples: Grass, trees, flowers, plants.
- Label: *Producers*
- Available Energy: ~ 10,000 kcal/m²/year *(This is a typical value used in ecological models)*

#### 2. Primary Consumers (Second Trophic Level)
- Herbivores that eat producers.
- Examples: Cow, squirrel, bee.
- Label: *Primary Consumers*
- Available Energy: ~ 1,000 kcal/m²/year
*(10% of 10,000 = 1,000)*

#### 3. Secondary Consumers (Third Trophic Level)
- Carnivores or omnivores that eat primary consumers.
- Examples: Spider, snake.
- Label: *Secondary Consumers*
- Available Energy: ~ 100 kcal/m²/year
*(10% of 1,000 = 100)*

#### 4. Tertiary Consumers (Fourth Trophic Level)
- Top predators that eat secondary consumers.
- Example: Hawk (eagle).
- Label: *Tertiary Consumers*
- Available Energy: ~ 10 kcal/m²/year
*(10% of 100 = 10)*

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✔ Now, fill in the worksheet:

#### Left Side (Labels for each trophic level):
From bottom to top:
1. Producers
2. Primary Consumers
3. Secondary Consumers
4. Tertiary Consumers

#### Right Side (Available Energy at each level):
From bottom to top:
1. 10,000 kcal/m²/year
2. 1,000 kcal/m²/year
3. 100 kcal/m²/year
4. 10 kcal/m²/year

> Note: The actual values may vary slightly depending on the model, but 10,000 → 1,000 → 100 → 10 is standard for educational purposes.

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📝 Final Answer Summary:

| Trophic Level | Label | Available Energy |
|----------------------|------------------------|------------------------|
| Bottom Layer | Producers | 10,000 kcal/m²/year |
| Second Layer | Primary Consumers | 1,000 kcal/m²/year |
| Third Layer | Secondary Consumers | 100 kcal/m²/year |
| Top Layer | Tertiary Consumers | 10 kcal/m²/year |

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💡 Why does energy decrease?

Because:
- Energy is lost as heat during metabolic processes.
- Not all biomass is consumed or digestible.
- Only ~10% of energy is passed to the next level.

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✔ You can now label the worksheet accordingly!