3rd grade science Worksheets, word lists and activities - Free Printable

Let's solve the worksheet step by step.

Understanding the Concepts:

1. Producers – These are living things that make their own food using sunlight, water, and carbon dioxide through photosynthesis. They are usually plants or some types of bacteria.
- Example: Plants, algae, and certain bacteria.

2. Consumers – These organisms cannot make their own food. They must eat other living things to get energy.
- Examples: Animals like elephants, tigers, bears, etc.

3. Decomposers – These break down dead plants and animals into simpler substances. They recycle nutrients back into the soil.
- Examples: Fungi (like mushrooms), bacteria, earthworms (though sometimes debated, they're often classified as decomposers in basic science).

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Now, let’s identify each organism:

1. Grass
→ Makes its own food via photosynthesis.
✔ Producer

2. Earthworm
→ Eats dead plant material and helps break it down. It’s a detritivore and acts like a decomposer.
✔ Decomposer

3. Elephant
→ Eats plants (herbivore). Cannot make its own food.
✔ Consumer

4. Mushroom
→ A fungus that breaks down dead organic matter.
✔ Decomposer

5. Bacteria
→ Some bacteria are decomposers; they break down dead matter. In this context, especially with "decomposer" mentioned, we assume these are decay-causing bacteria.
✔ Decomposer

6. Blackberry plant
→ A green plant that makes its own food.
✔ Producer

7. Tiger
→ Carnivore; eats other animals.
✔ Consumer

8. Grizzly bear
→ Omnivore, eats both plants and animals, but cannot make its own food.
✔ Consumer

9. Acacia tree
→ A plant that produces its own food through photosynthesis.
✔ Producer

10. Milk snake
→ A predator; eats small animals.
✔ Consumer

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✔ Final Answers:

1. grass – producer
2. earthworm – decomposer
3. elephant – consumer
4. mushroom – decomposer
5. bacteria – decomposer
6. blackberry plant – producer
7. tiger – consumer
8. grizzly bear – consumer
9. acacia tree – producer
10. milk snake – consumer

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📝 Explanation Summary:

- Producers are self-sufficient in making food (plants).
- Consumers rely on eating others for energy (animals).
- Decomposers break down dead matter (fungi, bacteria, worms).

This classification helps us understand how energy flows in ecosystems!

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