1. The number of naturally occurring elements is

2. The main components of environment are

3. Which gass is used in photosynthesis?

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

5. Air contain.................. Nitrogen

6. The protective layer of leaf is called

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

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

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

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

11. A solution consisting of two substances is called

12. Ability to do work is called

13. Olfactory nerves links....... and...........

14. Matter consisting of one kind of atoms is called

15. Which substance is called universal solvent

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

17. Which factor affects the soulbality of substances

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

19. Gear system is an advanced shape of

20. Air contains 0.03%...........

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

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

23. How Many types of mixture

24. What is receptor

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

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

27. ................. Cell has only one large vacule

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

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

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