Food chains in the water: Cut and paste activity for Grade 2 science.

Solution to the Food Chain Worksheet

We are given a food chain activity with four organisms:
- Algae
- Fish
- Seal
- Shark

We need to arrange them in the correct order to show the flow of energy in a marine food chain. Energy flows from producers (like algae) to consumers (animals that eat other organisms), moving up the chain.

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Step-by-step Reasoning:

1. Start with the producer:
- Algae are producers. They make their own food using sunlight (photosynthesis).
→ So, Algae should be at the bottom of the food chain.

2. What eats algae?
- Small fish often feed on algae or tiny organisms that live near algae.
→ Fish eat algae (or plankton that feed on algae).

3. What eats fish?
- Seals eat fish. Seals are carnivores and consume smaller fish.

4. What eats seals?
- Sharks are apex predators and often eat seals.

So, the flow of energy is:
> Algae → Fish → Seal → Shark

This means energy starts with algae and moves up through each level.

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Correct Arrangement in the Boxes:

Let’s label the boxes in the diagram:

```
[Algae] → [Fish]
↓
[Seal] ← [Shark]
```

Wait — this arrangement doesn’t follow the arrow directions properly.

Looking at the arrows:
- Top left → top right
- Then down to bottom right
- Then left to bottom left

So the sequence is:
1. Top Left
2. Top Right
3. Bottom Right
4. Bottom Left

The arrows form a path:
→ → ↓ ←

So the flow is:
Top Left → Top Right → Bottom Right ← Bottom Left

Wait — that would mean:
- Top Left → Top Right
- Top Right → Bottom Right
- Bottom Right ← Bottom Left → which implies Bottom Left → Bottom Right

But the arrow points from Bottom Right to Bottom Left? No — the arrow is pointing left, so it's Bottom Right → Bottom Left

That would reverse the flow.

Wait — let's clarify the direction of the arrows:

- Arrow from Top Left → Top Right
- Arrow from Top Right ↓ to Bottom Right
- Arrow from Bottom Right ← to Bottom Left → meaning Bottom Left is before Bottom Right

So the full sequence is:
1. Top Left
2. Top Right
3. Bottom Right
4. Bottom Left

But that would be:
Top Left → Top Right → Bottom Right → Bottom Left?

But the last arrow is from Bottom Right to Bottom Left, so the flow is:

Top Left → Top Right → Bottom Right → Bottom Left

But that ends at Bottom Left, which would be the final consumer.

But we want the shark at the top (the top predator).

So let's assign the animals correctly based on energy flow.

We know:
- Algae → Fish → Seal → Shark

So the shark is at the end of the chain.

Now, following the arrows:

- Start: Top Left → Top Right → Bottom Right → Bottom Left

So:
- Top Left = Algae
- Top Right = Fish
- Bottom Right = Seal
- Bottom Left = Shark

Because:
- Algae → Fish → Seal → Shark

And the arrows go:
- Top Left → Top Right (Algae → Fish)
- Top Right ↓ Bottom Right (Fish → Seal)
- Bottom Right ← Bottom Left → Wait! This arrow goes from Bottom Right to Bottom Left, so it's Seal → Shark?

No — if the arrow is pointing left, then it's going from Bottom Right to Bottom Left.

So:
- Bottom Right → Bottom Left

So:
- Bottom Right = Seal
- Bottom Left = Shark

Then:
- Seal → Shark

Yes! That makes sense.

So the full chain is:
1. Top Left: Algae
2. Top Right: Fish
3. Bottom Right: Seal
4. Bottom Left: Shark

With arrows:
- Algae → Fish → Seal → Shark

Perfect!

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✔ Final Answer for the Diagram:

- Top Left: Algae
- Top Right: Fish
- Bottom Right: Seal
- Bottom Left: Shark

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Answer to the Question:

> Is the shark a predator or prey?

- The shark eats the seal, so it is a predator.
- It is not eaten by anything else in this chain (it’s at the top).
- So, shark is a predator.

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✔ Final Answer:

Shark is a predator.

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Summary:

Food Chain Order:
1. Algae →
2. Fish →
3. Seal →
4. Shark

Shark = Predator ✔