Food Chains Food Webs and Energy Pyramid Worksheets - Free Pintables - Free Printable

Let's solve the Food Chain and Energy Pyramid Worksheet step by step.

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Direction 1: Answer the following questions

#### Given Food Chain:
☀️ (Sun) → 🌱 (Grass) → 🦓 (Zebra)

> a. Identify the autotroph and heterotroph in the food chain.

- (i) Autotroph: Grass
- *Explanation:* Autotrophs are organisms that can produce their own food using sunlight (photosynthesis). Grass is a plant, so it is an autotroph.

- (ii) Heterotroph: Zebra
- *Explanation:* Heterotrophs cannot make their own food and must consume other organisms. The zebra eats grass, so it is a heterotroph.

> b. Is giraffe a primary or a secondary consumer?

- Answer: Primary consumer
- *Explanation:* A giraffe eats plants (like leaves), so it directly consumes producers (autotrophs). Organisms that eat producers are called primary consumers. Secondary consumers eat primary consumers (e.g., a lion eating a giraffe).

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Direction 2: Label each organism in the energy pyramid

We are given an energy pyramid with different organisms at different levels. Let’s analyze each one based on its position and feeding habits.

The pyramid has:

- Bottom level (Producer): Plants – Cactus, Tree, Grass, Flower
- Second level (Primary Consumers): Herbivores – Butterfly, Grasshopper, Squirrel, Frog?
- Wait — let’s look carefully:
- Butterflies and grasshoppers eat plants → Primary consumers.
- Squirrel eats seeds/nuts → Primary consumer.
- Frog eats insects → Secondary consumer.
- Snake eats frogs or mice → Tertiary consumer.
- Owl and Hawk eat small animals → Top predators.
- Spider eats insects → Secondary/tertiary?

But we need to fill the table for these specific organisms:

| Name of the Organisms | Autotroph/Heterotroph | Role in the Trophic Level |
|------------------------|------------------------|----------------------------|
| Cactus | Autotroph | Producer |
| Grasshopper | Heterotroph | Primary Consumer |
| Snake | Heterotroph | Secondary or Tertiary Consumer |
| Frog | Heterotroph | Secondary Consumer |
| Tree | Autotroph | Producer |
| Hawk | Heterotroph | Tertiary Consumer (Top Predator) |
| Butterfly | Heterotroph | Primary Consumer |

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Now, let's go through each one with explanation:

1. Cactus
- Autotroph – It makes its own food via photosynthesis.
- Role: Producer

2. Grasshopper
- Heterotroph – Eats plants.
- Role: Primary Consumer (eats producers)

3. Snake
- Heterotroph – Eats other animals (like frogs).
- Role: Secondary or Tertiary Consumer
- If snake eats a frog (which eats insects), then snake is secondary if frog is primary, but usually snakes are tertiary consumers in such pyramids.
- Here, snake is above frog → Tertiary Consumer

4. Frog
- Heterotroph – Eats insects like grasshoppers.
- Role: Secondary Consumer (eats primary consumers)

5. Tree
- Autotroph – Makes its own food.
- Role: Producer

6. Hawk
- Heterotroph – Eats smaller animals (like snakes or birds).
- Role: Tertiary Consumer / Apex Predator

7. Butterfly
- Heterotroph – Feeds on nectar from flowers (plants).
- Role: Primary Consumer

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✔ Final Completed Table:

| Name of the Organisms | Autotroph/Heterotroph | Role in the Trophic Level |
|------------------------|------------------------|----------------------------|
| Cactus | Autotroph | Producer |
| Grasshopper | Heterotroph | Primary Consumer |
| Snake | Heterotroph | Tertiary Consumer |
| Frog | Heterotroph | Secondary Consumer |
| Tree | Autotroph | Producer |
| Hawk | Heterotroph | Tertiary Consumer |
| Butterfly | Heterotroph | Primary Consumer |

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🔍 Summary of Key Concepts:

- Autotrophs: Make their own food (e.g., plants, trees, cacti).
- Heterotrophs: Must consume others for energy.
- Producers: First trophic level (autotrophs).
- Primary Consumers: Eat producers (herbivores).
- Secondary Consumers: Eat primary consumers (carnivores or omnivores).
- Tertiary Consumers: Eat secondary consumers (top predators).

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✔ Final Answers:

Direction 1:
a. (i) Autotroph: Grass
(ii) Heterotroph: Zebra
b. Giraffe is a primary consumer.

Direction 2: See completed table above.

Let me know if you'd like this as a printable version!