Science 7 · Unit 4: Grouping and identifying organisms · Cambridge Lower Secondary Science Stage 7

Questions

1. 1. Complete the sentence: Viruses are very ...

   • small
   • big
   Check

2. 2. Complete the sentence: Viruses are not made of ...

   • cells
   • protein
   • chemicals
   • particles
   Check

3. 3. Complete the sentence: Viruses can only ... when they are inside a living cell.

   • replicate
   • move
   • grow
   • die
   Check

4. 4. Where can a virus replicate (make copies of itself)?

   • only inside a living cell
   • only in soil
   • anywhere in the air
   • only in water
   Check

5. 5. What is the outer coat of a virus made of?

   • protein
   • a cell wall
   • cells
   • cellulose
   Check

6. 6. Scientist A says viruses are living organisms. Which fact supports this view?

   • They can reproduce (replicate) inside cells.
   • They are not made of cells.
   • They do not feed.
   • They do not respire.
   Check

7. 7. Scientist B says viruses are not living organisms. Which fact supports this view?

   • They are not made of cells, and they do not feed or respire.
   • They can make copies of themselves.
   • They are very small.
   • They cause diseases.
   Check

8. 8. Why do scientists not all agree about whether viruses are alive?

   • Viruses show some characteristics of life, but not others.
   • Nobody has ever seen a virus.
   • Viruses are made of cells.
   • Viruses are too big to study.
   Check

9. 9. H3N2 viruses killed about one million people in 1968–1969. Which illness do they cause?

   • influenza (flu)
   • a cold sore
   • malaria
   • Covid-19
   Check

10. 10. True or false: Some viruses infect plant cells.

    • True
    • False
    Check

11. 11. A new virus appeared in 2019. Its name is SARS-CoV-2. Which illness does it cause?

    • Covid-19
    • influenza
    • H3N2
    • measles
    Check

12. 12. A SARS-CoV-2 virus has spike proteins on the outside. What do they do?

    • They help the virus swim.
    • They help the virus attach to cells and get inside.
    • They make food for the virus.
    • They protect the virus from heat.
    Check

13. 13. In which year were viruses first discovered?

    • 1892
    • 1952
    • 1792
    • 2002
    Check

14. 14. You use the internet to find out how viruses were discovered. Which website is most likely to be reliable?

    • the first advert in the search results
    • a website selling medicines
    • a stranger's social media post
    • a university or a science organisation website
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15. 15. How can you check that information about viruses from a website is reliable?

    • Compare it with other reliable websites and books.
    • Use only the first website you find.
    • Believe the website with the most pictures.
    • Choose the website with the longest text.
    Check