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1. Which vitamin is mainly produced in the body by sunlight
2. Which gas is necessary for breathing
3. Which organ pumps blood in the human body
4. Which part of the plant prepares food
5. Water boils at what temperature at normal pressure
6. The freezing point of water is
7. Which metal is liquid at room temperature
8. Which planet is known as the Blue Planet
9. Which is the nearest star to Earth
10. Which force pulls objects toward Earth
11. Sound cannot travel through
12. Which organ helps us to breathe
13. Which blood cells help fight disease
14. Which part of the eye controls the amount of light entering
15. Which gas do plants release during photosynthesis
16. Which vitamin is mainly found in citrus fruits
17. Which mineral is important for strong bones
18. Which disease is caused by lack of vitamin D
19. Which disease is caused by lack of vitamin C
20. Which instrument is used to measure temperature
21. Which instrument is used to measure blood pressure
22. Which organ removes waste from blood
23. Which part of the body helps in thinking
24. Which simple machine is used to draw water from a well
25. Which source of energy is renewable
26. Which fuel is commonly called LPG
27. Which part of a computer is called its brain
28. Which device is used to store food at low temperature
29. Why do we see lightning before thunder
30. Which organ stores bile