1. The living things which eat Grass are called

2. Which of them is the most important machine

3. Which gas is used in photosynthesis

4. What is called universal solvent

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

6. Which of them is best solvent

7. Planet and their moons are the examples of

8. A solution consisting of two substance is called

9. The living things which eat meat are called

10. The main components of environment are called

11. Animals cells can not prepare their food because

12. Sound can not travel in vacuum because

13. The percentage of nitrogen in the air is

14. What is the speed of sound in air

15. The power house of cell is called

16. What are tissues

17. Which organisms are called producers

18. A machine makes the work

19. which statement is true

20. Which of them is energy of the sun