Science Worksheets for Grade 3 Students | Worsheets library - 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 are often classified as decomposers because they break down organic matter).

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Now let’s classify each organism:

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

2. Earthworm
→ Eats dead plant material and helps decompose it.
✔ Decomposer

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

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

5. Bacteria
→ Many bacteria break down dead matter (e.g., in soil). Some are decomposers.
✔ Decomposer *(Note: Not all bacteria are decomposers, but in this context, it refers to decomposer bacteria)*

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. Still needs to consume food.
✔ Consumer

9. Acacia tree
→ A green plant that uses photosynthesis.
✔ Producer

10. Milk snake
→ A predator; eats small animals like mice, frogs, etc.
✔ 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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📝 Summary:

- Producers: Grass, blackberry plant, acacia tree
- Consumers: Elephant, tiger, grizzly bear, milk snake
- Decomposers: Earthworm, mushroom, bacteria

This classification helps us understand how energy flows through ecosystems! 🌱🐍🍄