1. Air contains 0.03%...........

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

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

4. A solution consisting of two substances is called

5. The protective layer of leaf is called

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

7. The main components of environment are

8. Gear system is an advanced shape of

9. Ability to do work is called

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

11. Olfactory nerves links....... and...........

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

13. The number of naturally occurring elements is

14. ................. Cell has only one large vacule

15. How Many types of mixture

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

17. Which factor affects the soulbality of substances

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

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

20. Air contain.................. Nitrogen

21. Which gass is used in photosynthesis?

22. Matter consisting of one kind of atoms is called

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

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

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

26. What is receptor

27. Which substance is called universal solvent

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

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

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