1. Which gas is used in photosynthesis

2. Planet and their moons are the examples of

3. Which organisms are called producers

4. What are tissues

5. The living things which eat both plants and meat are called

6. The power house of cell is called

7. The living things which eat meat are called

8. The living things which eat Grass are called

9. The percentage of nitrogen in the air is

10. Sound can not travel in vacuum because

11. What is called universal solvent

12. A solution consisting of two substance is called

13. Which of them is the most important machine

14. Which of them is best solvent

15. Animals cells can not prepare their food because

16. which statement is true

17. A machine makes the work

18. The main components of environment are called

19. Which of them is energy of the sun

20. What is the speed of sound in air