Educational worksheet for interpreting a food web, showing animals and plants with questions about energy transfer and trophic levels.

Let’s go step by step to solve this food web worksheet.

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Part 1: Complete the food web by placing arrows

In a food web, arrows point from the organism being eaten → to the organism that eats it. So we need to think about who eats whom in nature:

- Wildflowers and Grass are plants → they are producers (they make their own food).
- Rabbit eats plants → so arrow from Wildflowers/Grass → Rabbit
- Mouse also eats plants → arrow from Wildflowers/Grass → Mouse
- Snake eats small animals like mice → arrow from Mouse → Snake
- Hawk eats rabbits and snakes → arrows from Rabbit → Hawk and Snake → Hawk

So the full set of arrows should be:
- Wildflowers → Rabbit
- Grass → Rabbit
- Wildflowers → Mouse
- Grass → Mouse
- Mouse → Snake
- Rabbit → Hawk
- Snake → Hawk

*(Note: Sometimes hawks also eat mice directly — but since the diagram doesn’t show an arrow from mouse to hawk, we’ll stick with what’s implied by typical simple food webs unless told otherwise. But actually, looking at common ecology, hawks DO eat mice too. However, since the question says “complete the given food web” and only shows those 6 organisms, we’ll assume standard connections based on diet.)*

Actually, let’s double-check real-world diets:
- Rabbits: herbivores → eat grass & wildflowers ✔
- Mice: omnivores but mostly eat seeds/plants → eat grass & wildflowers ✔
- Snakes: carnivores → eat mice (and sometimes rabbits, but usually smaller prey) → here, likely just mouse ✔
- Hawks: birds of prey → eat rabbits, snakes, and mice → so probably ALL three? But again, for simplicity in school worksheets, often only direct links shown. Since snake is between mouse and hawk, maybe hawk eats snake and rabbit, not directly mouse? Let’s follow logic: if snake eats mouse, and hawk eats snake, then energy flows mouse→snake→hawk. Also hawk may eat rabbit directly.

But to keep it clean and match typical textbook answers:

Arrows:
- Grass → Rabbit
- Wildflowers → Rabbit
- Grass → Mouse
- Wildflowers → Mouse
- Mouse → Snake
- Rabbit → Hawk
- Snake → Hawk

That covers all logical feeding relationships without overcomplicating.

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Part 2: Answer questions using the food web

a) Name the producers.

Producers are organisms that make their own food — usually plants. In this diagram:
→ Wildflowers and Grass

b) Name any four consumers.

Consumers are organisms that eat other organisms. All animals here are consumers:
→ Rabbit, Mouse, Snake, Hawk
(You can pick any four — there are exactly four consumers total.)

c) What is eaten by the snake?

From our arrow placement:
→ Mouse

d) What does the hawk eat?

From our arrow placement:
→ Rabbit and Snake

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Part 3: Fill in the blanks

> In any food web, energy is ___ every time one organism eats another. Because of this, there must be many ___ plants than there are plant-eaters. There are more ___ than heterotrophs and more plant-eaters than ___. Each successive level has about ___ less energy available because some energy is lost as heat at each trophic level.

Let’s fill these logically:

1. Energy is lost every time one organism eats another. (Only ~10% transfers up; rest is used or lost as heat)

2. There must be many more plants than plant-eaters. (Because you need lots of base to support fewer above)

3. There are more autotrophs than heterotrophs.
- Autotrophs = producers (plants)
- Heterotrophs = consumers (animals)
→ Yes, always more producers than consumers in biomass/numbers

4. More plant-eaters than meat-eaters (or carnivores / secondary consumers).
→ Plant-eaters are primary consumers; meat-eaters are higher up → fewer of them

5. Each successive level has about 90% less energy available.
→ Standard rule: only 10% passes to next level → so 90% is lost

Wait — let’s check wording: “about ___ less energy available”

If 10% remains, then 90% is lost → so yes, “90% less” is correct phrasing.

Some might say “only 10%”, but the blank says “___ less”, so “90%” fits.

Alternatively, sometimes it's written as “each level has about 90% less energy than the level below”.

Yes.

Final filled sentence:

> In any food web, energy is lost every time one organism eats another. Because of this, there must be many more plants than there are plant-eaters. There are more autotrophs than heterotrophs and more plant-eaters than carnivores. Each successive level has about 90% less energy available because some energy is lost as heat at each trophic level.

*(Note: For #4, “meat-eaters” is acceptable for younger students, but “carnivores” is more precise. Since the worksheet uses terms like “heterotrophs”, “carnivores” is fine. Alternatively, “secondary consumers” — but “carnivores” is simpler and matches context.)*

Actually, let’s see: “plant-eaters” vs “___” — parallel structure. Plant-eaters are herbivores. The opposite would be carnivores or meat-eaters. Either works. I’ll use “carnivores” for accuracy.

Also, for #3: “autotrophs” is correct scientific term matching “heterotrophs”. If student hasn’t learned that word yet, maybe “producers”? But the sentence says “than heterotrophs”, so best to pair with “autotrophs”.

But wait — in middle school science, they might expect “producers” instead of “autotrophs”. Let me check common curriculum.

Actually, looking at the worksheet title: “Interpreting a Food Web” — likely grades 5–8. They may know “producers” and “consumers”, but “autotrophs/heterotrophs” might be introduced later.

However, the sentence says: “There are more ___ than heterotrophs” — so it’s testing whether student knows that autotrophs > heterotrophs in number/biomass.

To be safe, I’ll use “producers” — because earlier part asks for “producers”, so consistent terminology.

Revised:

> In any food web, energy is lost every time one organism eats another. Because of this, there must be many more plants than there are plant-eaters. There are more producers than heterotrophs and more plant-eaters than carnivores. Each successive level has about 90% less energy available because some energy is lost as heat at each trophic level.

Yes — this uses familiar terms.

“Carnivores” could also be “meat-eaters” — but “carnivores” is standard.

Another option for last blank before 90%: “top predators” or “tertiary consumers” — but again, “carnivores” is simplest and accurate.

I think “carnivores” is best.

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Now, compiling final answers clearly.

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Final Answer:

Food Web Arrows (directions):
- Wildflowers → Rabbit
- Grass → Rabbit
- Wildflowers → Mouse
- Grass → Mouse
- Mouse → Snake
- Rabbit → Hawk
- Snake → Hawk

Questions:
a) Producers: Wildflowers, Grass
b) Four consumers: Rabbit, Mouse, Snake, Hawk
c) Eaten by snake: Mouse
d) Hawk eats: Rabbit and Snake

Fill in the blanks:
In any food web, energy is lost every time one organism eats another. Because of this, there must be many more plants than there are plant-eaters. There are more producers than heterotrophs and more plant-eaters than carnivores. Each successive level has about 90% less energy available because some energy is lost as heat at each trophic level.