Classification of Living Things - Worksheets.5th Grade | PDF - Free Printable

Here's the complete solution to all the tasks shown in your image:

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4. Write some differences between vertebrate and invertebrate animals.

✔ Differences:

- Vertebrates have a backbone (spinal column) made of bone or cartilage; invertebrates do not have a backbone.
- Vertebrates usually have an internal skeleton (endoskeleton); invertebrates may have no skeleton, or an external one (exoskeleton).
- Vertebrates generally have more complex organ systems (e.g., advanced brain, closed circulatory system); invertebrates often have simpler systems.
- Vertebrates include fish, amphibians, reptiles, birds, and mammals; invertebrates include insects, worms, jellyfish, snails, spiders, etc.
- Most vertebrates are larger and more mobile; many invertebrates are small and may be sessile (fixed in place).

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5. Complete the chart.

| Feature | Fish | Amphibians | Reptiles | Birds | Mammals |
|----------------------------|-------------------|-------------------|-------------------|-------------------|-------------------|
| They breathe through | Gills | Gills (larvae), Lungs & skin (adults) | Lungs | Lungs | Lungs |
| Their body is covered with | Scales | Smooth, moist skin | Dry, scaly skin | Feathers | Hair/Fur |
| Their limbs are | Fins | Webbed feet | Legs (often clawed) | Wings & legs | Legs (varied) |
| Their reproduction is | Lay eggs in water | Lay eggs in water | Lay shelled eggs on land | Lay hard-shelled eggs | Give birth to live young (mostly) |

> 💡 *Note: Some exceptions exist (e.g., lungfish, some amphibians give live birth, some mammals lay eggs like platypus), but this chart reflects general characteristics.*

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6. Match.

You have 4 images and 4 labels.

✔ Correct matching:

- Top-left image (jellyfish) → jellyfish
- Bottom-left image (spider) → arthropod *(Spiders are arthropods)*
- Top-right image (snail) → mollusc *(Snails are mollusks)*
- Bottom-right image (earthworm) → earthworm

> 📝 *“Arthropod” is a phylum that includes insects, spiders, crustaceans — so spider matches “arthropod”. “Mollusc” includes snails, clams, octopuses. “Jellyfish” is its own category (cnidarian). “Earthworm” is an annelid.*

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7. Label the parts of the insect.

An insect has 3 main body parts and 6 legs. Common labeled parts:

✔ Standard labels for a mosquito (or generic insect):

*(Assuming lines point to these parts — label from top to bottom, left to right as typical in diagrams)*

Left side (from top to bottom):
1. Head
2. Thorax
3. Abdomen

Right side (from top to bottom):
1. Antenna
2. Wing
3. Leg

> 🐞 *Insect anatomy:*
> - Head: contains eyes, antennae, mouthparts.
> - Thorax: middle section; attaches wings and legs.
> - Abdomen: rear section; contains digestive and reproductive organs.
> - Antennae: sensory organs on head.
> - Wings: used for flying (most adult insects have 2 pairs).
> - Legs: 6 legs total, attached to thorax.

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✔ Final Answer Summary:

Q4: Vertebrates have backbones; invertebrates don’t. Vertebrates have internal skeletons; invertebrates may have exoskeletons or none. Vertebrates are generally more complex.

Q5: Chart filled as above.

Q6:
- Jellyfish → jellyfish
- Spider → arthropod
- Snail → mollusc
- Earthworm → earthworm

Q7:
- Left: Head, Thorax, Abdomen
- Right: Antenna, Wing, Leg

Let me know if you’d like printable versions or diagrams!