The Fundamental Unit of Life | Important Questions | Biology Class 9

 

1. Who discovered the first cell under microscope?
2. Name the scientist who discovered the first living cell?
3. What is the meaning of the word cell that is derived from Latin?
4. What is the source for the cork that was used by Robert Hooke?
5. What is cell theory? Name the scientist who proposed it.
6. How did Rudolf Virchow modified the cell theory that was given by Schleiden and Schwann?
7. State the contribution of Robert Brown in Discovery cell component
8. Differentiate between unicellular and multicellular organisms. Provide examples for each.
9. Why do cells have a particular shape and size?
10. What do you mean by division of labour inside a cell?
11. What is protoplasm?
12. Who coined the term protoplasm?
13. What is the role of plasma membrane in a cell?
14. Why is the plasma membrane referred to as a selectively permeable?
15. Explain how the exchange of O2 and CO2 takes place in a cell.
16. Define osmosis.
17. What do you understand by hypotonic, hypertonic and isotonic solution? Also mention what will happen to a cell that is place in these solutions.
18. How do plant cells gain water?
19. State the composition of plasma membrane.
20. How can you observe the plasma membrane?
21. Define endocytosis and exocytosis. Give examples of endocytosis.
22. State the role of cell wall in plants. Also provides its major component.
23. Define plasmolysis.
24. State the reason as to why the plant cell can with stand hypotonic solution for a long time without bursting.
25. Name at least two different stains that could be used to colour the cells for observing under microscope.
26. The nucleus is surrounded by how many membranes? Also mention its role.
27. State the composition of chromatin.
28. Provide the full form of DNA and RNA.
29. Define Gene.
30. When can you see chromatin in a cell?
31. State the function of nucleus.
32. Differentiate between prokaryotic and eukaryotic cell. Also provide examples for both
33. How are the chlorophyll present in case of prokaryotic cell?
34. State the role of cytoplasm in a cell
35. What are the two types of ER? Mention their role in detail
36. What do you understand by membrane biogenesis?
37. Name the organelle involved in detoxification drugs and poisons
38. State the structural composition of Golgi Apparatus.
39. Name the scientist who discovered Golgi apparatus.
40. List out any four roles of Golgi bodies.
41. Why are lysosomes referred to as a scavenger of cell?
42. How are the membranes of mitochondria organised?
43. Why are Cisterns present in mitochondria?
44. What is the full form of ATP and why are referred to as the energy currency of the cell?
45. What are the 3 different types of plastids and what role do they have in a cell?
46. Name the cytoplasmic equivalent found in mitochondria and plastids.
47. Name two cell organelles that contains DNA other than nucleus.
48. List out 3 locations within the cell where protein synthesis could occur.
49. Why do plants have large Central vacuole?
50. Why do you call the cell structural and functional unit of life?
51. A cell having 12 chromosomes undergoes meiotic cell division. What will be the number of chromosomes in the daughter cells?
52. Name the cell division type involved in the production of gametes are reproductive cells.
53. In a particular cell division, the number of chromosomes in the mother cell and the daughter cells remains the same. Identify the cell division type.
54. How many daughter cells are produced at the end of single cell division in mitosis and meiosis?