Science one-word quiz

Write a one-word answer for each question.

1. The lightest gas

2. Water changing into vapour is called

3. The instrument used to measure atmospheric pressure

4. The star at the centre of our solar system

5. The powerhouse of the cell

6. The SI unit of force

7. The organ that pumps blood around the body

8. The transfer of pollen from anther to stigma

9. Animals that eat only plants are called

10. The part of a plant that absorbs water from the soil

11. The largest organ of the human body

12. The largest planet in the solar system

13. The process by which a seed starts to grow into a plant

14. The planet closest to the Sun

15. Animals without a backbone are called

16. The hard natural substance that is the hardest known

17. The planet we live on

18. The SI unit of electric current

19. Animals with a backbone are called

20. The SI unit of mass

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