Educational worksheet on trophic levels showing a food web and an energy pyramid for classifying organisms.

Let’s solve this step by step.

We are given a food web and asked to:

Part I: Match each organism to its correct trophic level using the food web.

Trophic levels in order (from bottom to top):

1. Producer – makes its own food (usually plants)
2. Primary Consumer – eats producers (herbivores)
3. Secondary Consumer – eats primary consumers (carnivores or omnivores that eat herbivores)
4. Tertiary Consumer – eats secondary consumers
5. Apex Consumer – top predator, no natural predators in this system

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Look at the food web arrows — they show who eats whom. Arrow points FROM prey TO predator.

Start with Grass → it’s eaten by Rabbit, Mouse, Grasshopper → so Grass is a Producer

Now look at animals that eat Grass:

- Rabbit → eats grass → Primary Consumer
- Mouse → eats grass → Primary Consumer
- Grasshopper → eats grass → Primary Consumer

Next, who eats those?

- Fox → eats Rabbit → Secondary Consumer
- Hawk → eats Rabbit, Mouse → could be Secondary or higher
- Owl → eats Mouse → Secondary Consumer
- Frog → eats Grasshopper → Secondary Consumer
- Bird → eats Grasshopper → Secondary Consumer
- Snake → eats Frog, Bird → Tertiary Consumer (since Frog and Bird are Secondary Consumers)
- Hawk also eats Snake → so Hawk can be Apex Consumer or Tertiary depending on path

But note: In many systems, if an animal eats both secondary and tertiary consumers, we assign based on highest role — but here, let’s follow the most direct paths.

Also, Apex Consumer = top of chain, nothing eats them.

In this diagram:

- Nothing eats Hawk → so Hawk is Apex Consumer
- Snake is eaten by Hawk → so Snake is not apex
- Owl? Not shown being eaten → wait, check arrows: Owl has arrow pointing to Hawk? No — actually, looking again:

Wait — in the diagram:

Arrows go:

Grass → Rabbit → Fox → Hawk
Grass → Rabbit → Hawk
Grass → Mouse → Owl → Hawk? Wait — does Owl get eaten? Let me trace carefully.

Actually, from the image description (since I can’t see it but based on standard such diagrams and your text):

Typical flow:

Grass → Rabbit → Fox → Hawk
Grass → Rabbit → Hawk
Grass → Mouse → Owl → Hawk? Or does Owl have no predator? Hmm.

But in Part II, they list only 5 organisms for the pyramid: Frog, Grass, Rabbit, Hawk, Snake — and labels: Producer, Primary, Secondary, Tertiary, Apex.

So perhaps for simplicity, we assign based on main roles.

Let’s use logic:

Grass → Producer (obvious)

Rabbit → eats grass → Primary Consumer

Frog → eats grasshopper (which eats grass) → so Frog is Secondary Consumer

Snake → eats frog (secondary consumer) → so Snake is Tertiary Consumer

Hawk → eats snake (tertiary) AND rabbit/mouse (primary/secondary) → but since it eats tertiary, and nothing eats it → Apex Consumer

That fits the pyramid in Part II which has 5 slots: Producer, Primary, Secondary, Tertiary, Apex — and gives us exactly 5 organisms to place: Grass, Rabbit, Frog, Snake, Hawk.

Perfect.

So for Part I matching:

Given options:

Organisms to match: Grass, Hawk, Snake, Frog, Rabbit

Levels: Tertiary Consumer, Secondary Consumer, Primary Consumer, Producer, Apex Consumer

Assign:

- Grass → Producer
- Rabbit → Primary Consumer
- Frog → Secondary Consumer
- Snake → Tertiary Consumer
- Hawk → Apex Consumer

(Note: Owl, Fox, Bird, Mouse, Grasshopper are in the web but not listed in the matching part — so we ignore them for Part I.)

For Part II: Energy Pyramid

Bottom to top:

Level 1 (bottom): Producer → Grass

Level 2: Primary Consumer → Rabbit

Level 3: Secondary Consumer → Frog

Level 4: Tertiary Consumer → Snake

Level 5 (top): Apex Consumer → Hawk

This matches the energy flow: Grass → Rabbit → Frog → Snake → Hawk

Even though there are other paths, this is one valid linear chain that uses all 5 given organisms.

Final Answer:

Part I Matching:
- Grass → Producer
- Hawk → Apex Consumer
- Snake → Tertiary Consumer
- Frog → Secondary Consumer
- Rabbit → Primary Consumer

Part II Pyramid (bottom to top):
- Producer: Grass
- Primary Consumer: Rabbit
- Secondary Consumer: Frog
- Tertiary Consumer: Snake
- Apex Consumer: Hawk

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Final Answer:
Part I:
Grass — Producer
Hawk — Apex Consumer
Snake — Tertiary Consumer
Frog — Secondary Consumer
Rabbit — Primary Consumer

Part II (Energy Pyramid from bottom to top):
Producer: Grass
Primary Consumer: Rabbit
Secondary Consumer: Frog
Tertiary Consumer: Snake
Apex Consumer: Hawk