1. The largest artery is

2. Bile is released by

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

4. Blood is carried from lungs to heart by

5. In which waves particles of medium move perpendicularly

6. Which circuit is used in domestic wiring

7. Human heart has ...............chambers

8. There are ...............major habitats.

9. What is the name of our Galaxy

10. Food for algae is

11. Sound can not pass through

12. Water is essential for

13. What is the unit of frequency

14. By addition of what food becomes soft and fine

15. flowers are .................part of plant

16. The lightest part of atom is

17. Where are pollen grains located in

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

19. The rate of flow of charge is called

20. The reverse process of peristalsis is called