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The insect body plan

Science · Insects & Minibeasts · ages 7-9

Name ______________________ Date ____________

How many legs are in the usual body plan of an adult insect?
- 4
- 6
- 8
Which body part sits in the middle of an insect, between the head and the abdomen?
- Thorax
- Antenna
- Exoskeleton
Insects have bones inside their bodies, just like you do.
Circle one: True False
Two adult beetles each have six legs. How many legs do they have in total?
Answer: ______________
On an adult grasshopper, which body part do the six legs attach to?
- Head
- Thorax
- Abdomen
Which body part has the antennae?
- Head
- Thorax
- Abdomen
Ben says a beetle needs internal bones to support its body. Which reply fits the lesson?
- Yes. Its internal bones support it just like yours do.
- No. A beetle's body has no supporting covering at all.
- No. Its outer exoskeleton supports its body.
Mia finds an adult beetle with a damaged leg. She says it is no longer an insect. Which reply fits the lesson?
- A damaged leg turns a beetle into a spider.
- A damaged leg does not change its animal group.
- A beetle is an insect only if all its legs work.

Answer key

For grown-ups. Fold this page away before handing over the rest.

6 · The usual adult insect body plan has three pairs of legs, making six.
Thorax · The thorax is the middle part. The head is at the front, and the abdomen is at the back.
False · Insects have no internal bones. Their outer covering, called an exoskeleton, supports and protects their bodies.
12 · Count six legs for each beetle: 6 + 6 = 12.
Thorax · The six legs attach to the thorax, the middle body part.
Head · Antennae are on the head, along with the eyes and mouth.
No. Its outer exoskeleton supports its body. · The beetle has no internal bones. Its outer exoskeleton supports and protects its body.
A damaged leg does not change its animal group. · The beetle is still an insect. Damage to an individual leg does not change the animal's group.