Marshall Cavendish Cambridge Primary Science (2nd edition)
Stage 4
Homework worksheet
(The following content has not been through the Cambridge Assessment International Education
endorsement process.)
Homework worksheet
Chapter 1: Bones and Muscles
Worksheet 1 (Bones and the Skeleton & Muscles and Movement)
1.
Write the correct names of the bones in the boxes.
femur
humerus
rib cage
skull
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spine
2. Some students are talking about parts of the skeleton and their functions.
The spine supports the upper part of
the body.
Aini
The skull protects the heart.
Pamela
The rib cage protects the lungs.
Sam
One of the students has made an incorrect statement. Circle the name of the student.
Aini
Pamela
Sam
3. Our muscles need to work in pairs to make the bones move. Use the words below to
complete the following sentences.
contracts
biceps
relaxes
triceps
(a) One muscle ___________________ and the other _______________ to allow us
to bend or straighten our arms and legs.
(b) Our _____________ and our ____________ work together to allow us to bend
and straighten our arm.
4. Peter and Samir were playing soccer. Peter fell down and bumped his head. Explain
how his skull helped him to prevent serious injury.
_______________________________________________________________
_______________________________________________________________
5. Why is exercise good for your bones and muscles?
_______________________________________________________________
_______________________________________________________________
© 2022 Marshall Cavendish Education Pte Ltd
Marshall Cavendish Cambridge Primary Science (2nd edition)
Stage 4
Homework worksheet
(The following content has not been through the Cambridge Assessment International Education
endorsement process.)
Worksheet 2 (Animals and Skeletons)
1. Circle the correct word to complete the sentence.
A living thing is called a vertebrate if it has a _________.
backbone
head
neck
tail
2. Many animals have a skeleton on the outside of their body. What is it called?
Tick (√) the correct answer.
 exoskeleton
 invertebrate
 skeleton
 vertebrate
3. Look at the key below.
Based on the key, which of these is a spider? Circle the correct answer.
A
B
C
D
E
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F
4. What is the difference between vertebrates and invertebrates?
_________________________________________________________________
5. Write two ways in which an exoskeleton is useful to an animal.
_________________________________________________________________
_________________________________________________________________
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Answers
Worksheet 1 (Bones and the Skeleton & Muscles and Movement)
1.
2. Pamela
3. (a) One muscle contracts/relaxes and the other relaxes/contracts to allow us to
bend or straighten our arms and legs.
(b) Our biceps/triceps and our triceps/biceps work together to allow you to bend
and straighten your arm.
4. His skull protected his brain from getting injured when he fell.
5. Exercise makes our bones and muscles strong and healthy.
Worksheet 2 (Animals and Skeletons)
1. backbone
2. exoskeleton
3. F
4. Vertebrates have a backbone. Invertebrates do not have a backbone.
5. An exoskeleton supports the animal’s body. The exoskeleton protects the
animal’s body.
© 2022 Marshall Cavendish Education Pte Ltd