1. What two structures on the microscope will you use to focus on your specimen? 2. Why should you never use the coarse adjustment knob on high power?

3. When do you use the fine adjustment knob?

4. Our microscopes have three objectives. What are their powers?

5. What is the magnification of the ocular lens?

6. What is the shortest objective called?

7. How do you switch objectives?

8. Which structure controls how much light passes through the specimen?

9.How should you carry the microscope?

10. How can you prevent your slide from slipping on the stage?

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex