Class 9th Biology Chapter 5 Cell Cycle

biology 9th notes Chapter No 5

1. Mitosis consists of phases:


2. The cells of ______________ enter G0 phase semi-permanently.


3. Cell duplicates its chromosomes in ___________ phase.


4. What happens in prophase?


5. In plant cell division of cytoplasm involves fusion of vesicles coming from:


6. The longest phase in meiosis is:


7. A tumor, which remains in their original location, is called:


8. Which is NOT the function of mitosis?


9. Which of the following is not the event of G1 phase?


10. which event distinguishes meiosis from mitosis?


11. The process of mitosis ensures that:


12. Who suggested the name mitosis?


13. Mitosis is divided into _______ major phases.


14. The cells of ___________ remain in G0 phase for indefinite period.


15. A membrane-bounded disc formed in plant cell to divide cytoplasm is called:


16. In animal cell division of ___________ occurs by a process called cleavage.


17. Which process does not occur in prokaryotes?


18. In which stage of the cell cycle each chromosome is duplicated and so consists of two chromatids?


19. A cell in which chromosomes are in pairs is:


20. Accidental Death of Cells and Living Tissues is called:


21. The result of meiosis in one cell is production of ________ daughter cells.


22. Which stage of cell division is very different in animal and plant cell division?


23. The cell division will not occur if________________ does (do) not happen.


24. Complete set of spindle fibres are produced by:


25. The series of events from the time a cell is produced until it completes division and produces new cell, is called:


26. The phase in which crossing over occur:


27. The products are connected by a centromere and are called:


28. Duplication of Chromosomes occurs in


29. Those cells which give rise to gametes are called


30. Who observed the process of crossing over in fruit fly?


31. Malignant tumors can send cancer cells to other parts of body where new tumors may form. This phenomenon is called:


32. Two centrioles are present outside the nucleus, this is collectively called as:


33. If you observe a cell like this one, what phase of mitosis is it?


34. In which stage of cell cycle, the cell is preparing enzymes for chromosomes duplication?


35. The division of cytoplasm is called:


36. The genetic material duplicates in:


37. Chiasmata is formed during:


38. In ____________ phase cells have temporarily or permanently stopped dividing.


39. After meiosis I haploid daughter cells enter a period of rest called:


40. The division in prokaryotes is not called mitosis because:


41. Cells that form the body of the organism are called:


42. In G2 phase the cell prepares proteins that are essential for:


43. What is TRUE about metaphase?


44. Which phases is the opposite of prophase?


45. Which phase of meiosis is similar to mitosis?


46. Each pair of homologous chromosomes are called:


47. Karyokinesis include ___________ phases.


48. Cytokinesis in a plant cell is characterized by:


49. Meiosis results in the:


50. In which stage of the cell cycle, the cell is preparing enzymes for chromosome duplication?


51. Which stage of the cell cycle most cells spend their lives?


52. Who discovered meiosis for the first time?


53. The chromosomes arrange themselves along the equator of the cell in phase:


54. In plants spindle fibres are produced by:


55. The cell cycle consists of ________ major phases.


56. During ____________ a cell divides into two daughter cells, each with the same number of chromosomes as were present in parent cell.


57. Interphase for at lasts for at least ___________ of the total time required for the cell cycle.


58. Errors in the control of mitosis may cause:


59. Interphase II of meiosis is different from interphase I because:


60. The process of meiosis was discovered in:


61. The exchange of genetic material is called:


62. During which phase of mitosis spindles are formed?


63. During which phase of cell cycle spindles fibre are formed


64. Which of the following is the phase of interphase?


65. Which of the following cells do not enter G0 phase and continue to divide throughout an organism’s life?


66. Which phase is the longest in meiosis?


67. The division of cytoplasm is called:


68. Karyokinesis is the division of:


69. Which of the following stage of cell division is very different for animal and plant cells?


70. The word Meiosis derived from Greek, means:


71. Which event distinguishes meiosis from mitosis?


72. Abnormal separation of chromosomes is called:


73. The longest phase of Cell Cycle is:


74. Breaking of chiasmata occur during:


75. Which of the following distinguishes meiosis from mitosis?


76. What is TRUE about kinetochore protein?


77. For mitosis, the chromosomes of cell duplicate during interphase when do the chromosomes duplicate for meiosis?


78. The process in which individuals produce offspring like themselves is called:


79. Complete set of spindle fibre is known as:


80. A cell with half number of chromosome is called:


Short Questions

1. A nerve cell does not divide after its formation, in which phase of cell cycle it is?
2. Define Apoptosis.
3. Define Budding.
4. Define Crossing Over.
5. Define disjunction.
6. Define G2 Phase.
7. Define Malignant Tumors.
8. Define Metastasis.
9. Define Mitosis.
10. Define Necrosis. Give its causes.
11. Define non-disjunction.
12. Define Phragmoplast or cell plate..
13. Define Spindle fibres.
14. Define Synapsis.
15. Define Tumor.
16. Describe Anaphase.
17. Describe Benign tumour.
18. Differentiate between chromosomes and chromatin.
19. Differentiate between diploid cells and haploid cells.
20. Differentiate between mitosis and meiosis.
21. Explain G0 Phase.
22. Explain Interphase as a major phase of cell.
23. For what purpose are the enzymes used in brewing industry and paper industry?
24. Give four causes of Necrosis.
25. Give two advantages of apoptosis.
26. How can sea star regenerate its lost arms?
27. How can the enzyme production be regulated?
28. How cytokinesis occurs in plant cells?
29. How do enzymes lower the activation energy?
30. How does cytokinesis take place in animal cells?
31. Name the phases of interphase. 
32. What are “blebs”? What are the other names of blebs?
33. What are active sites?
34. What are coenzymes? Give examples.
35. What are cofactors? Give examples.
36. What are different phases of mitosis?
37. What are enzymes?
38. What are the enzymes used in food industry?
39. What are the uses of enzymes in biological detergents?
40. What changes occur in a cell during S-Phase?
41. What do you know about the term Interkinesis? How it is different from interphase?
42. What happens if there is no synthesis of protein during G-2 Phase?
43. What is a metabolic pathway?
44. What is alternation of generation?
45. What is Cell cycle?
46. What is Chiasmata?
47. What is Cytokinesis?
48. What is G1 Phase?
49. What is Kinetochore?
50. What is lock and key model?
51. What is meant be ES complex?
52. What is meant by prosthetic groups?
53. What is meant by the word meiosis?
54. What is meiosis?
55. What is Metaphase plate?
56. What is Metaphase?
57. What is M-Phase?
58. What is S-Phase?
59. What is suggested in induced-fit model about enzyme action?
60. What is the difference between somatic and germ line cells?
61. What is the difference between somatic cells and gamete?
62. What is the role of lysosomes in Necrosis?
63. When and who discovered the process of Mitosis?
64. Which events occur during Apoptosis?
65. Who studied crossing over in fruit fly?
66. Why is the cell division in prokaryotes not called mitosis?
67. Why it is impossible to reverse the cell cycle?

Long Questions

1. Compare mitosis and meiosis.
2. Contrast mitosis and meiosis, emphasizing the events that lead to different outcomes.
3. Define Meiosis and describe its different phases.
4. Describe different phase of Eukaryotic cell cycle.
5. Describe errors in meiosis.
6. Describe errors in mitosis
7. Describe necrosis and apoptosis.
8. Describe prophase of mitosis in details.
9. Describe significance of meiosis.
10. Describe significance of mitosis
11. Describe the events that occur during the phases of meiosis-I.
12. Describe the significance of meiosis.
13. Explain different phases of division of nucleus.
14. Explain metaphase and anaphase.
15. Give a comparison between mitosis and meiosis.
16. How cell die? Explain.
17. How is mitosis significant?
18. How would you state the events of prophase of mitosis?
19. Make a list of the events of mitosis.
20. The S-phase of interphase is important and a cell can never divide without it. Justify.
21. What is cell cycle and what are its main phases?
22. What is cell cycle? Explain its phases.
23. Write a detailed note on Apoptosis.
24. Write a note on apotosis.
25. Write a note on cytokinesis.
26. Write a note on Meiosis-II.
27. Write a note on necrosis.
28. Write a note on Prophase-I.
29. Write a short note one Apoptosis and Necrosis.
30. Write down the significance of meiosis.
31. Write down the significance of mitosis.
32. Write four differences of Mitosis and Meiosis.

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