1. Air contain.................. Nitrogen

2. ....................... Is a friendly relationship between two organisms

3. Which factor affects the soulbality of substances

4. The number of naturally occurring elements is

5. The particles are settled down at the bottom of the container.

6. Olfactory nerves links....... and...........

7. The speed of sound is........... Meter per second in iron

8. The part of the solution which is less in quantity called

9. The biotic components of the environment Include..............

10. The energy in an object due its motion is called

11. Air contains 0.03%...........

12. The structural and functional unit of life is called ....................

13. The energy in an object due its pissition is called

14. How Many types of mixture

15. .................. is used in electric bulbs and flourescent lamps

16. Which gass is used in photosynthesis?

17. ................. Cell has only one large vacule

18. The animals which kill and hunt other animals for food called

19. Ability to do work is called

20. Which of the following is not detected by skin?

21. The main components of environment are

22. A solution consisting of two substances is called

23. What is receptor

24. Which substance is called universal solvent

25. Meteoroid which burns after entering earth's atmosphere is called

26. America launched its first space station skylab into space in

27. A spherical mirror whose inner surface is reflecting is called

28. Matter consisting of one kind of atoms is called

29. The protective layer of leaf is called

30. Gear system is an advanced shape of