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1. Which gas is most abundant in Earth’s atmosphere
2. Which vitamin is produced in the human body by sunlight
3. Which part of the plant conducts photosynthesis
4. What is the boiling point of water at sea level
5. Which metal is liquid at room temperature
6. Which organ pumps blood in the human body
7. Which gas is used by plants during photosynthesis
8. The SI unit of energy is
9. Which organ helps in breathing
10. Which force pulls objects toward the Earth
11. Which blood cells fight infection
12. What is the chemical formula of water
13. Which planet is known as the Red Planet
14. Which gas is essential for human respiration
15. Which vitamin helps in blood clotting
16. Which instrument measures temperature
17. Which gas causes the greenhouse effect
18. Which organ filters blood in the human body
19. Which vitamin deficiency causes night blindness
20. What is the SI unit of electric current
21. Which gas is commonly used in balloons
22. Which organ produces insulin
23. Which part of the brain controls balance
24. Which metal is used in electrical wiring
25. Which disease is caused by deficiency of iodine
26. Which device converts electrical energy into mechanical energy
27. Which layer protects Earth from harmful UV rays
28. Which organ produces bile in the human body
29. Which gas is required for combustion
30. Which blood component helps in clotting