1. Which organisms are called producers

2. What are tissues

3. Which of them is the most important machine

4. A solution consisting of two substance is called

5. Planet and their moons are the examples of

6. What is the speed of sound in air

7. A machine makes the work

8. The power house of cell is called

9. Animals cells can not prepare their food because

10. The main components of environment are called

11. What is called universal solvent

12. Which of them is energy of the sun

13. Which gas is used in photosynthesis

14. The living things which eat Grass are called

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

16. which statement is true

17. Which of them is best solvent

18. Sound can not travel in vacuum because

19. The living things which eat meat are called

20. The percentage of nitrogen in the air is