class 9 biology mcq of chapter 4 cell cycle

  100 MCQs on Chapter 4: The Cell Cycle for Class 9 Biology. 

11. Which phase comes after G1 phase in interphase?

A) Option1
B) Option2
C) S phase
D) Option4
Answer: C) S phase

12. In which phase of mitosis does the nuclear envelope break down?
A) Option1
B) Option2
C) Prophase
D) Option4
Answer: C) Prophase

13. During which phase are sister chromatids separated?
A) Option1
B) Option2
C) Anaphase
D) Option4
Answer: C) Anaphase

14. What forms at the end of telophase in plant cells?
A) Option1
B) Option2
C) Cell plate
D) Option4
Answer: C) Cell plate

15. What structure forms the spindle fibers?
A) Option1
B) Option2
C) Centrioles
D) Option4
Answer: C) Centrioles

16. Which organelle is responsible for organizing spindle fibers?
A) Option1
B) Option2
C) Centrosome
D) Option4
Answer: C) Centrosome

17. In animal cells, cytokinesis occurs through the formation of a:
A) Option1
B) Option2
C) Cleavage furrow
D) Option4
Answer: C) Cleavage furrow

18. Which phase prepares the cell for mitosis by synthesizing proteins?
A) Option1
B) Option2
C) G2 phase
D) Option4
Answer: C) G2 phase

19. What happens to the chromosomes during metaphase?
A) They condense
B) They move to poles
C) They align at the equator
D) They disappear
Answer: C) They align at the equator

20. Which of the following phases is the shortest?
A) Prophase
B) Metaphase
C) Anaphase
D) Interphase
Answer: C) Anaphase

21. What ensures equal distribution of chromosomes during mitosis?
A) Nuclear envelope
B) Centromeres
C) Spindle fibers
D) Ribosomes
Answer: C) Spindle fibers

22. The point where two sister chromatids are attached is called:
A) Centrosome
B) Centriole
C) Centromere
D) Nucleolus
Answer: C) Centromere

23. Which structure disappears during prophase?
A) Chromosomes
B) Spindle fibers
C) Nuclear envelope
D) Cytoplasm
Answer: C) Nuclear envelope

24. During which phase do chromosomes uncoil into chromatin?
A) Anaphase
B) Telophase
C) Prophase
D) Metaphase
Answer: B) Telophase

25. The cell cycle in human cells takes about:
A) 2 hours
B) 8 hours
C) 24 hours
D) 72 hours
Answer: C) 24 hours

26. Mitosis results in:
A) Two identical daughter cells
B) Four identical daughter cells
C) Two different daughter cells
D) One large cell
Answer: A) Two identical daughter cells

27. What triggers the cell to start mitosis?
A) Completion of S phase
B) Cell size
C) External signals
D) All of the above
Answer: D) All of the above

28. If a cell skips the G1 phase, it will likely:
A) Grow faster
B) Not replicate DNA
C) Divide immediately
D) Die
Answer: B) Not replicate DNA

29. Which phase comes immediately after telophase?
A) Prophase
B) Cytokinesis
C) Anaphase
D) G1 phase
Answer: B) Cytokinesis

30. What forms the boundary between two daughter cells in animal cells?
A) Cell wall
B) Cell membrane
C) Cleavage furrow
D) Chromosomes
Answer: C) Cleavage furrow

31. Why is mitosis important?
A) Genetic variation
B) Tissue repair
C) Sexual reproduction
D) Mutation
Answer: B) Tissue repair

32. Which of the following is not a purpose of mitosis?
A) Growth
B) Repair
C) Asexual reproduction
D) Formation of gametes
Answer: D) Formation of gametes

33. Which phase is associated with chromosome duplication?
A) G2 phase
B) M phase
C) S phase
D) G1 phase
Answer: C) S phase

34. In which type of organisms is mitosis most important for reproduction?
A) Mammals
B) Birds
C) Plants
D) Single-celled organisms
Answer: D) Single-celled organisms

35. Which organelle is duplicated during the G2 phase?
A) Ribosomes
B) Centrioles
C) Golgi bodies
D) Lysosomes
Answer: B) Centrioles

36. Cells that no longer divide are in which phase?
A) G1 phase
B) G2 phase
C) G0 phase
D) M phase
Answer: C) G0 phase

37. Which cells do not usually undergo mitosis?
A) Skin cells
B) Nerve cells
C) Liver cells
D) Muscle cells
Answer: B) Nerve cells

38. Mitosis is also known as:
A) Meiosis I
B) Reduction division
C) Equational division
D) Binary fission
Answer: C) Equational division

39. In plant cells, what helps in cell plate formation?
A) Vesicles from Golgi apparatus
B) Spindle fibers
C) Ribosomes
D) Nucleus
Answer: A) Vesicles from Golgi apparatus

40. What would happen if DNA did not replicate during the S phase?
A) Cells would grow normally
B) Cells would have double DNA
C) Cells would have half DNA
D) Chromosomes would multiply
Answer: C) Cells would have half DNA

41. Which checkpoint ensures DNA is correctly duplicated before mitosis?
A) G1 checkpoint
B) G2 checkpoint
C) M checkpoint
D) Cytokinesis
Answer: B) G2 checkpoint

42. What happens during the G1 phase?
A) DNA replication
B) Cytokinesis
C) Cell growth and organelle synthesis
D) Chromosome separation
Answer: C) Cell growth and organelle synthesis

43. How many chromosomes are in the daughter cells after mitosis in humans?
A) 92
B) 23
C) 46
D) 44
Answer: C) 46

44. What are the threadlike structures containing genetic material?
A) Ribosomes
B) Chromosomes
C) Lysosomes
D) Centrioles
Answer: B) Chromosomes

45. What separates the sister chromatids during anaphase?
A) Cell wall
B) Nucleus
C) Spindle fibers
D) Centrosomes
Answer: C) Spindle fibers

46. When does the nucleolus disappear in the cell cycle?
A) Telophase
B) Prophase
C) Anaphase
D) Cytokinesis
Answer: B) Prophase

47. Which of the following is not part of mitosis?
A) Prophase
B) Interphase
C) Anaphase
D) Telophase
Answer: B) Interphase

48. What structure reappears during telophase?
A) Centriole
B) Chromosomes
C) Nucleolus
D) Golgi body
Answer: C) Nucleolus

49. Which type of cell division leads to genetically identical cells?
A) Meiosis
B) Fission
C) Mitosis
D) Conjugation
Answer: C) Mitosis

50. In multicellular organisms, mitosis helps in:
A) Reproduction
B) Mutation
C) Growth and repair
D) Digestion
Answer: C) Growth and repair

51. DNA is in the form of chromatin during which phase?
A) Prophase
B) Metaphase
C) Telophase
D) Interphase
Answer: D) Interphase

52. Which of the following best defines the cell cycle?
A) A cycle of energy generation
B) A series of cell organelle changes
C) A series of events for cell division
D) DNA synthesis only
Answer: C) A series of events for cell division

53. What is the role of kinetochores?
A) Form chromosomes
B) Attach spindle fibers to centromeres
C) Break nuclear envelope
D) Repair DNA
Answer: B) Attach spindle fibers to centromeres

54. What is the result of an error during mitosis?
A) Equal cell formation
B) Genetic mutation
C) Reproduction
D) Proper chromosome number
Answer: B) Genetic mutation

55. What phase follows anaphase?
A) Metaphase
B) Prophase
C) Telophase
D) Interphase
Answer: C) Telophase

56. What happens if the spindle fibers fail during mitosis?
A) Cells multiply faster
B) DNA will replicate
C) Chromosomes will not separate properly
D) Nucleus will reform early
Answer: C) Chromosomes will not separate properly

57. What phase has visible, condensed chromosomes?
A) Interphase
B) Telophase
C) Prophase
D) Cytokinesis
Answer: C) Prophase

58. The cell membrane pinches inward during:
A) Telophase in plant cells
B) Cytokinesis in animal cells
C) Prophase in animal cells
D) Metaphase in plant cells
Answer: B) Cytokinesis in animal cells

59. What regulates the timing of the cell cycle?
A) Enzymes
B) Hormones
C) Cyclins
D) DNA polymerase
Answer: C) Cyclins

60. What is true about daughter cells formed by mitosis?
A) They are genetically different
B) They are smaller in size
C) They have half the DNA
D) They are genetically identical
Answer: D) They are genetically identical

61. What happens to organelles during the G1 phase?
A) They disappear
B) They double in number
C) They stop functioning
D) They move to daughter cells
Answer: B) They double in number

62. Which phase ensures the chromosomes are aligned correctly before separation?
A) G1 phase
B) Metaphase
C) Anaphase
D) Cytokinesis
Answer: B) Metaphase

63. Which phase is responsible for synthesizing DNA?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Answer: B) S phase

64. Which of these best describes mitosis?
A) One division, two daughter cells
B) Two divisions, four daughter cells
C) One division, four daughter cells
D) Multiple fission
Answer: A) One division, two daughter cells

65. The protein that controls the progression of the cell cycle is called:
A) Histone
B) Cyclin
C) Enzyme
D) Kinase
Answer: B) Cyclin

66. What separates the cytoplasm in cytokinesis?
A) Chromosomes
B) Spindle fibers
C) Cell membrane
D) Nucleus
Answer: C) Cell membrane

67. What is the full form of DNA?
A) Deoxynucleic Acid
B) Dinuclear Acid
C) Deoxyribonucleic Acid
D) Dicarboxylic Acid
Answer: C) Deoxyribonucleic Acid

68. What forms between two plant cells during cytokinesis?
A) Cleavage furrow
B) Chromatin
C) Cell plate
D) Centriole
Answer: C) Cell plate

69. What is the role of centrosomes?
A) Digest nutrients
B) Guide chromosome movement
C) Store proteins
D) Produce energy
Answer: B) Guide chromosome movement

70. What happens to the chromosomes in prophase?
A) They dissolve
B) They duplicate
C) They condense and become visible
D) They align at the center
Answer: C) They condense and become visible

71. In mitosis, each daughter cell has how many chromosomes compared to the parent cell?
A) Double
B) Half
C) One-fourth
D) Same
Answer: D) Same

72. What is the final stage of the cell cycle?
A) M phase
B) Cytokinesis
C) S phase
D) G1 phase
Answer: B) Cytokinesis

73. What structure helps in moving chromosomes during mitosis?
A) Cytoplasm
B) Nucleolus
C) Spindle fibers
D) Mitochondria
Answer: C) Spindle fibers

74. During which phase does DNA replication occur?
A) Prophase
B) G1 phase
C) S phase
D) Telophase
Answer: C) S phase

75. Which term describes a resting stage where the cell is not dividing?
A) G1 phase
B) G2 phase
C) M phase
D) G0 phase
Answer: D) G0 phase

76. Chromatids are joined together at the:
A) Nucleus
B) Centrosome
C) Centromere
D) Telomere
Answer: C) Centromere

77. Which phase ensures cell size and environment are favorable for DNA synthesis?
A) G2 phase
B) G0 phase
C) G1 checkpoint
D) M checkpoint
Answer: C) G1 checkpoint

78. The nuclear envelope reforms during:
A) Prophase
B) Metaphase
C) Anaphase
D) Telophase
Answer: D) Telophase

79. What marks the end of mitosis?
A) Formation of nuclear envelope
B) Separation of chromatids
C) Chromosome alignment
D) Spindle formation
Answer: A) Formation of nuclear envelope

80. Which type of cell division is used for growth and maintenance?
A) Binary fission
B) Mitosis
C) Meiosis
D) Conjugation
Answer: B) Mitosis

81. Which process ensures each daughter cell receives an identical set of chromosomes?
A) Meiosis
B) Replication
C) Mitosis
D) Mutation
Answer: C) Mitosis

82. In which phase do spindle fibers attach to centromeres?
A) Prophase
B) Metaphase
C) Telophase
D) Cytokinesis
Answer: B) Metaphase

83. What is the correct order of mitosis phases?
A) Prophase, Anaphase, Metaphase, Telophase
B) Anaphase, Telophase, Prophase, Metaphase
C) Prophase, Metaphase, Anaphase, Telophase
D) Telophase, Metaphase, Anaphase, Prophase
Answer: C) Prophase, Metaphase, Anaphase, Telophase

84. What phase occurs just before cell division begins?
A) Interphase
B) Cytokinesis
C) Telophase
D) Metaphase
Answer: A) Interphase

85. Which checkpoint controls the transition from metaphase to anaphase?
A) G1 checkpoint
B) G2 checkpoint
C) M checkpoint
D) S checkpoint
Answer: C) M checkpoint

86. If a cell is damaged and cannot repair DNA, it may undergo:
A) Replication
B) Mutation
C) Apoptosis
D) Cytokinesis
Answer: C) Apoptosis

87. What is the main event of anaphase?
A) Nuclear membrane breakdown
B) Chromosome condensation
C) Sister chromatid separation
D) Cell membrane pinching
Answer: C) Sister chromatid separation

88. The nucleolus is present during which phase?
A) Prophase
B) Metaphase
C) Interphase
D) Telophase
Answer: C) Interphase

89. How many chromatids are present in a duplicated chromosome?
A) 1
B) 2
C) 3
D) 4
Answer: B) 2

90. What ensures DNA is not damaged before entering S phase?
A) G0 phase
B) M checkpoint
C) G1 checkpoint
D) Telophase
Answer: C) G1 checkpoint

91. What happens if mitosis is uncontrolled?
A) Cells die immediately
B) Cancer can develop
C) Cells grow larger
D) Meiosis occurs
Answer: B) Cancer can develop

92. Which structure is present only in animal cells for mitosis?
A) Nucleus
B) Centriole
C) Cell plate
D) Chromatin
Answer: B) Centriole

93. Which is not a reason for a cell to divide?
A) Growth
B) Reproduction
C) Nutrient synthesis
D) Repair
Answer: C) Nutrient synthesis

94. What connects the two chromatids of a chromosome?
A) Kinetochores
B) Centrosomes
C) Centromeres
D) Nucleosomes
Answer: C) Centromeres

95. Which phase does the cell spend most of its life in?
A) M phase
B) Prophase
C) Interphase
D) Anaphase
Answer: C) Interphase

96. What occurs in G2 phase?
A) DNA replication
B) Spindle fiber formation
C) Organelle replication and growth
D) Chromatid separation
Answer: C) Organelle replication and growth

97. DNA content doubles during which phase?
A) M phase
B) S phase
C) G2 phase
D) Cytokinesis
Answer: B) S phase

98. Which cells in the human body divide most frequently?
A) Muscle cells
B) Brain cells
C) Skin cells
D) Liver cells
Answer: C) Skin cells

99. What is the result of cytokinesis?
A) Formation of chromatin
B) Nuclear division
C) Formation of two daughter cells
D) Chromosome duplication
Answer: C) Formation of two daughter cells

100. What happens if the G2 checkpoint fails?
A) The cell exits the cycle
B) DNA is not replicated
C) Mitosis starts with damaged DNA
D) Cytokinesis occurs early
Answer: C) Mitosis starts with damaged DNA