1. The living things which eat Grass are called

2. What are tissues

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

4. The percentage of nitrogen in the air is

5. What is the speed of sound in air

6. Sound can not travel in vacuum because

7. A solution consisting of two substance is called

8. Which of them is best solvent

9. A machine makes the work

10. Animals cells can not prepare their food because

11. The power house of cell is called

12. The main components of environment are called

13. Which organisms are called producers

14. Which of them is the most important machine

15. Which of them is energy of the sun

16. Planet and their moons are the examples of

17. The living things which eat meat are called

18. What is called universal solvent

19. which statement is true

20. Which gas is used in photosynthesis