1. Which circuit is used in domestic wiring

2. Blood is carried from lungs to heart by

3. There are ...............major habitats.

4. Water is essential for

5. Human heart has ...............chambers

6. The reverse process of peristalsis is called

7. The rate of flow of charge is called

8. The largest artery is

9. Sound can not pass through

10. Where are pollen grains located in

11. What is the name of our Galaxy

12. What is the unit of frequency

13. Food for algae is

14. flowers are .................part of plant

15. In which waves particles of medium move perpendicularly

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

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

18. Bile is released by

19. By addition of what food becomes soft and fine

20. The lightest part of atom is