Energy Pyramid Practice Worksheet with food chains and blank pyramids for students to fill in.

Let's solve this Energy Pyramid Practice Worksheet step by step.

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🔷 Understanding the Energy Pyramid

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

Here’s what each trophic level represents:

- 1st Trophic Level: Producers (plants, algae, phytoplankton) – they make their own food via photosynthesis.
- 2nd Trophic Level: Primary Consumers – herbivores that eat producers.
- 3rd Trophic Level: Secondary Consumers – carnivores or omnivores that eat primary consumers.
- 4th Trophic Level: Tertiary Consumers – top predators that eat secondary consumers.

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✔ Fill in the blanks:

> 4th Trophic Level = Tertiary Consumers
> 3rd Trophic Level = Secondary Consumers
> 2nd Trophic Level = Primary Consumers
> 1st Trophic Level = Producer ✔

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Now, let’s place the organisms from each food chain into the correct levels on the pyramid.

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🔹 Food Chain 1: Acorn → Squirrel → Crow → Coyote

Let’s identify each organism’s role:

- Acorn → comes from an oak tree, which is a producer → 1st Trophic Level
- Squirrel → eats acorns (plant) → Primary Consumer → 2nd Level
- Crow → eats squirrels (meat) → Secondary Consumer → 3rd Level
- Coyote → eats crows → Tertiary Consumer → 4th Level

✔ So, in the pyramid:
- Bottom (1st): Acorn
- 2nd: Squirrel
- 3rd: Crow
- Top (4th): Coyote

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🔹 Food Chain 2: Phytoplankton → Shrimp → Snapper → Shark

- Phytoplankton → Producer → 1st Level
- Shrimp → eats phytoplankton → Primary Consumer → 2nd Level
- Snapper → eats shrimp → Secondary Consumer → 3rd Level
- Shark → eats snapper → Tertiary Consumer → 4th Level

✔ Pyramid order:
- 1st: Phytoplankton
- 2nd: Shrimp
- 3rd: Snapper
- 4th: Shark

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🔹 Food Chain 3: Grass → Mouse → Snake → Eagle

- Grass → Producer → 1st Level
- Mouse → eats grass → Primary Consumer → 2nd Level
- Snake → eats mouse → Secondary Consumer → 3rd Level
- Eagle → eats snake → Tertiary Consumer → 4th Level

✔ Pyramid order:
- 1st: Grass
- 2nd: Mouse
- 3rd: Snake
- 4th: Eagle

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✔ Final Answer Summary

#### Fill in the blanks:
- 4th Trophic Level = Tertiary Consumers
- 3rd Trophic Level = Secondary Consumers
- 2nd Trophic Level = Primary Consumers
- 1st Trophic Level = Producer

#### Food Chain 1:
```
Coyote
/
/
Crow
/
/
Squirrel
/
/
Acorn
```

#### Food Chain 2:
```
Shark
/
/
Snapper
/
/
Shrimp
/
/
Phytoplankton
```

#### Food Chain 3:
```
Eagle
/
/
Snake
/
/
Mouse
/
/
Grass
```

> Note: In real diagrams, the pyramid has four horizontal levels. The bottom layer is the widest (most energy), and the top is narrowest (least energy).

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📌 Explanation of Why This Works

- Energy flows one way: Sun → Producers → Consumers.
- At each step, most energy is lost as heat, movement, or waste.
- Only about 10% of energy moves to the next level (10% Rule).
- That’s why there are usually fewer organisms at higher levels — not enough energy to support large populations.

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✔ All done! You now know how to build energy pyramids based on food chains.