Educational worksheet on invertebrates with questions and images of various invertebrate animals.

Let’s go through each question one by one and find the correct answer.

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Question 1: What do invertebrates have in common?

Invertebrates are animals without a backbone. That’s their main feature.

- a) They don’t have a backbone or skeleton. → Correct! (They may have an exoskeleton, but no internal backbone.)
- b) Most have eight legs → No, only spiders and some others do. Insects have 6.
- c) Most have antennae → Not true — snails, octopuses, worms don’t.
- d) They all have exoskeleton → False — jellyfish, worms, octopus don’t.

✔ Correct answer: a

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Question 2: How many groups of arthropods are there?

Arthropods include insects, arachnids (spiders), myriapods (centipedes), and crustaceans (crabs). Annelids are worms — not arthropods.

- a) Arthropods, insects... → Wrong — “arthropods” is the big group, not a subgroup.
- b) Echinoderms, cnidarians... → Those are other phyla, not arthropod subgroups.
- c) Insects, arachnids, myriapods and crustaceans → ✔ YES! These are the 4 main classes of arthropods.
- d) Molluscs... → Those are a different animal group entirely.

✔ Correct answer: c

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Question 3: How many body parts have insects got?

Insects have 3 main body parts: head, thorax, abdomen.

- a) Five legs? No — they have 6 legs.
- b) Legs, head, thorax → Missing abdomen; also “legs” isn’t a body part category.
- c) Abdomen, head, cephalothorax → Cephalothorax is for spiders/crabs, not insects.
- d) A head, a thorax and an abdomen → ✔ Perfect!

✔ Correct answer: d

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Question 4: What kind of molluscs have a soft body?

All molluscs have soft bodies — that’s what defines them! Snails (gastropods), clams (bivalves), octopus (cephalopods) — all soft-bodied.

- a) Only cephalopods and gastropods? → No, bivalves too.
- b) Gastropods and bivalves? → Misses cephalopods.
- c) They all have a soft body → ✔ YES! All molluscs do.
- d) Cephalopods and bivalves? → Misses gastropods.

✔ Correct answer: c

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Question 5: Their bodies have lots of segments and lots of legs:

This describes centipedes and millipedes — which are called myriapods.

- a) Annelids → Worms — segmented, but no jointed legs.
- b) Myriapods → ✔ Yes! Many legs, many segments.
- c) Molluscs → Soft bodies, no segments or many legs.
- d) Insects → Only 6 legs, 3 body parts.

✔ Correct answer: b

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Question 6: They have 8 jointed legs and 2 body parts: cephalothorax and abdomen

That’s spiders, scorpions, ticks — these are arachnids.

- a) Myriapods → Too many legs.
- b) Echinoderms → Starfish — not even arthropods.
- c) Arachnids → ✔ Exactly! 8 legs, 2 body parts.
- d) Insects → 6 legs, 3 body parts.

✔ Correct answer: c

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Final Answer:
1. a
2. c
3. d
4. c
5. b
6. c