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Internal and external structures of animals

4th grade (Year 5 in England) · 16 questions · Common Core: NGSS.4-LS1-1 · England: KS2 Y4 Animals, including humans, KS2 Y3 Animals, including humans

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Date

Score/ 16

1
Question 1
A shark's skeleton is made of cartilage, not bone. Is it internal or external?
- A. external
- B. it is made of scales
- C. internal
- D. sharks have no skeleton
2
Question 2
What does this internal structure do: skeleton?
- A. controls the body and processes information
- B. supports and protects the body
- C. pumps blood around the body
- D. breaks down food
3
Question 3
Is this an internal or an external structure: the heart?
- A. external (outside the body)
- B. internal (inside the body)
4
Question 4
Insects have no bones. What holds their bodies up?
- A. their wings only
- B. a hard outer covering (exoskeleton)
- C. air inside them
- D. nothing; they are floppy
5
Question 5
What does this internal structure do: heart?
- A. controls the body and processes information
- B. pumps blood around the body
- C. breaks down food
- D. take in oxygen from the air
6
Question 6
Is this an internal or an external structure: a bird's feathers?
- A. external (outside the body)
- B. internal (inside the body)
7
Question 7
A shark's skeleton is made of cartilage, not bone. Is it internal or external?
- A. external
- B. sharks have no skeleton
- C. internal
- D. it is made of scales
8
Question 8
What does this internal structure do: lungs?
- A. take in oxygen from the air
- B. controls the body and processes information
- C. supports and protects the body
- D. breaks down food
9
Question 9
Is this an internal or an external structure: a turtle's shell?
- A. external (outside the body)
- B. internal (inside the body)
10
Question 10
Insects have no bones. What holds their bodies up?
- A. a hard outer covering (exoskeleton)
- B. nothing; they are floppy
- C. air inside them
- D. their wings only
11
Question 11
What does this internal structure do: stomach?
- A. pumps blood around the body
- B. controls the body and processes information
- C. breaks down food
- D. supports and protects the body
12
Question 12
Is this an internal or an external structure: a fish's fins?
- A. external (outside the body)
- B. internal (inside the body)
13
Question 13
Insects have no bones. What holds their bodies up?
- A. nothing; they are floppy
- B. a hard outer covering (exoskeleton)
- C. air inside them
- D. their wings only
14
Question 14
What does this internal structure do: heart?
- A. controls the body and processes information
- B. take in oxygen from water
- C. pumps blood around the body
- D. supports and protects the body
15
Question 15
Is this an internal or an external structure: a bird's feathers?
- A. external (outside the body)
- B. internal (inside the body)
16
Question 16
A crab sheds its shell as it grows. Why?
- A. It is too hot inside.
- B. Its shell is made of skin.
- C. The hard external shell cannot stretch, so it must be replaced by a bigger one.
- D. To change colour.

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Answer key: Internal and external structures of animals

1. C. internal
2. B. supports and protects the body
3. B. internal (inside the body)
4. B. a hard outer covering (exoskeleton)
5. B. pumps blood around the body
6. A. external (outside the body)
7. C. internal
8. A. take in oxygen from the air
9. A. external (outside the body)
10. A. a hard outer covering (exoskeleton)
11. C. breaks down food
12. A. external (outside the body)
13. B. a hard outer covering (exoskeleton)
14. C. pumps blood around the body
15. A. external (outside the body)
16. C. The hard external shell cannot stretch, so it must be replaced by a bigger one.