1. flowers are .................part of plant

2. What is the unit of frequency

3. What is the mode of  transferring of heat for energy of sun reaching  us

4. Human heart has ...............chambers

5. The lightest part of atom is

6. What is the name of our Galaxy

7. The largest artery is

8. The rate of flow of charge is called

9. In which waves particles of medium move perpendicularly

10. Sound can not pass through

11. Which circuit is used in domestic wiring

12. By addition of what food becomes soft and fine

13. Where are pollen grains located in

14. The reverse process of peristalsis is called

15. Bile is released by

16. which of the following is not used in human respiratory system

17. There are ...............major habitats.

18. Food for algae is

19. Blood is carried from lungs to heart by

20. Water is essential for