Science 4 · Unit 1: Living things · Cambridge Primary Science Stage 4

Questions

1. 1. When I lift a weight, what does the muscle at the front of my arm do?

   • It contracts and gets shorter.
   • It relaxes and gets longer.
   • It contracts and gets longer.
   • It pushes the lower arm up.
   Check

2. 2. When I lift a weight, what does the muscle at the back of my arm do?

   • It contracts and gets shorter.
   • It relaxes and gets longer.
   • It pulls the arm down.
   • It gets shorter and fatter.
   Check

3. 3. Why do muscles work in pairs?

   • A muscle can only pull, so another muscle must pull the bone back.
   • One muscle is not strong enough to pull at all.
   • Muscles can only push, so two are needed.
   • So that one muscle can sleep while the other one grows.
   Check

4. 4. When you lower your arm, what does the muscle at the back of your arm do?

   • It contracts and gets longer.
   • It relaxes and gets longer.
   • It contracts and gets shorter.
   • It relaxes and gets shorter.
   Check

5. 5. When you lower your arm, what does the muscle at the front of your arm do?

   • It contracts and gets shorter.
   • It relaxes and gets shorter.
   • It contracts and gets longer.
   • It relaxes and gets longer.
   Check

6. 6. How do muscles work?

   • by pushing on the bones
   • by making the bones longer
   • by bending the bones
   • by pulling on the bones they are joined to
   Check

7. 7. Choose the words to complete the sentence: When one muscle in a pair ___, the other muscle ___.

   • contracts ... relaxes
   • contracts ... contracts
   • relaxes ... relaxes
   • pushes ... pulls
   Check

8. 8. What happens to a muscle when it contracts?

   • It gets shorter and fatter.
   • It gets longer and thinner.
   • It turns into bone.
   • It stays the same.
   Check

9. 9. What happens to a muscle when it relaxes?

   • It gets shorter and fatter.
   • It gets longer and thinner.
   • It pulls hard on the bone.
   • It breaks.
   Check

10. 10. Which word means a muscle is working and pulling on a bone?

    • contracts
    • relaxes
    • stretches
    • bends
    Check

11. 11. Choose the word: The muscle that is resting ...

    • contracts
    • relaxes
    Check

12. 📖 This question is about a text that students read in the app.

    12. In the model arm, which part of the body does part A represent?

    • the front muscle
    • the back muscle
    • the upper arm bone
    • the lower arm bone
    Check

13. 📖 This question is about a text that students read in the app.

    13. Look at the model arm. Which part of the body is part C?

    • the upper arm bone
    • the lower arm bone
    • the front muscle
    • the back muscle
    Check

14. 📖 This question is about a text that students read in the app.

    14. Match each part of the model arm with the part of the body it shows.

    • A
    • B
    • C
    • D

    • lower arm bone
    • back muscle
    • upper arm bone
    • front muscle
    Check

15. 📖 This question is about a text that students read in the app.

    15. In the model arm, what happens to part C when you pull on part B?

    • It stays still.
    • It gets longer.
    • It drops.
    • It lifts.
    Check

16. 📖 This question is about a text that students read in the app.

    16. In Amira's model, you pull on part B. What does part B do?

    • It contracts and gets longer, and pushes part C up.
    • It relaxes and gets longer, and pushes part C down.
    • It contracts and gets shorter, and pulls part C up.
    • It relaxes and gets shorter, and pulls part C down.
    Check