Cell the basic unit of life

Cell The structural and functional unit of life. A lesson for std VIII Biology AP State Cell Diversity Types of cells Microscope structure, cell organelle differences of plant and animal cells prokaryotic and eukaryotic cells cell theory, scientists worked for invention of cell

1. Cell: The unit of life.

2. Before the first microscope was invented around 360 years ago, People were not aware of living world that was not visible to the naked eye.

3. Many Scientists were observing and describing unknown world with the help of Microscopes

4. Among them the most important scientists mentioned are. . . Athanasius Kircher 1601-1680

5. Zacharias Janssen Among them the most important scientists mentioned are. . .

6. Among them the most important scientists mentioned are. . . Jan Swammerdam 1637-1680

7. Among them the most important scientists mentioned are. . . Anthony Van Leeuwenhoek 1632-1723

8. Among them the most important scientists mentioned are. . . Robert Hooke 1635-1702

9. Among them the most important scientists mentioned are. . . Robert Brown 1773-1858

10. Felice Fontana 1730-1805 Among them the most important scientists mentioned are. . .

11. Discovery of the cell Robert Hooke in the year 1665 observed thin slices of cork under a simple magnifying device he designed.

12. Discovery of the cell He observed that the cork resembled the structure of honey comb consisting many empty box like cavities - Cells.

13. A significant observation In 1831 Robert Brown noticed a near- circular spot slightly more opaque than the surrounding areas.

14. A significant observation Robert Brown claimed that this structure was an integral part of the cell and called nucleus.

15. The Modern Cell Theory consists of three statements based on large body of scientific research. The orginal work was done by Schleiden, Schwan and Virchow

16. The cell is the fundamental unit of structure and function in living things. All living things are composed of cells. Cells come from pre existing cells.

17. Cell is a functional and Structural Unit of Life Each cell is a membrane bound body that contain all chemical molecules that help support organisms life.

18. Cell is composed of various parts. Cell is made up of 3 basic components Plasma membrane Nucleus Cytoplasm .

19. Plasma membrane is the outer most covering of the cell separates it contents from external environment. Plasma membrane is semi permeable membrane and made up of fats and proteins.

20. Nucleus is the control centre of the cell and has a double layered covering called nuclear membrane Nucleus contains genetic material (Chromosomes) Which will have DNA

21. * Nucleus * Membrane bound organelle * Cytoskeleton * Complex * No Nucleus * No Membrane bound Organelle * No Cytoskeleton * Simple . Cytoplasm DNA Plasma Membrane Eukaryotic Cell Prokaryotic Cell

22. Cytoplasm is the fluid substance that fill the cell and contain various organelle for various functions.

23. There are cells without nucleus they are called Prokaryotic cells. They do have Nucleoid

24. Cells with prominent nucleus are called Eukaryotic cells.

25. 0.1 -10 micro metes 10 -100 micro metes

26. Paramecium

27. Vacuole Chloroplast Flagellum Cellulose wall Eye spot Starch storage Chlamydomonas

28. Cell Organelle is a specialised membrane bound structure with in a eukaryotic cell which perform specific task

29. Cell Organelle – Endoplasmic Reticulum

30. Cell Organelle – Golgi apparatus

31. Cell Organelle – Mitochondrion

32. Cell Organelle – Chloroplast

33. Cell Organelle – Lysosome

34. Cell Organelle – Ribosome

35. Cell Organelle – Vacuole

36. Diversity in Cells The shape and size of cells vary considerably, ultimately determined by the function of the cell. The size of the organism depends on the number of cells and not the size of the cells

37. Diversity in Size The size of the organism depends on the number of cells and not the size of the cells

38. Diversity in Cells of a

39. Diversity in Cells

40. Diversity in Cells

41. Diversity in Cells

42. Diversity in Cells

43. Diversity in Cells

44. Diversity in Cells

45. Diversity in Cells size

46. Diversity in Cells size

47. Diversity in Cells size

48. Microscope

49. Microscope

50. Measure

51. International System Ruler

52. Exercise- Identify the parts

53. Exercise- Identify the parts

54. Exercise- Identify the parts

55. Exercise- Identify the parts

56. Exercise- Identify the parts