1. The largest artery is

2. Human heart has ...............chambers

3. Blood is carried from lungs to heart by

4. flowers are .................part of plant

5. In which waves particles of medium move perpendicularly

6. Where are pollen grains located in

7. What is the name of our Galaxy

8. Bile is released by

9. Food for algae is

10. The reverse process of peristalsis is called

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

12. The rate of flow of charge is called

13. Sound can not pass through

14. Water is essential for

15. There are ...............major habitats.

16. What is the unit of frequency

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

18. The lightest part of atom is

19. Which circuit is used in domestic wiring

20. By addition of what food becomes soft and fine