9th class Biology, Chapter 4: Cell Cycle MCQs

1. In which phase of cell cycle, maximum growth occurs in cell?

1. (A) M phase
2. (B) S phase
3. (C) G1 phase ✓
4. (D) G2 phase

2. In which phase of cell cycle, the chromosomes duplicate?

1. (A) Mitosis
2. (B) G1 phase
3. (C) G2 phase
4. (D) S phase ✓

3. Which of the following is NOT a characteristic of mitosis?

1. (A) It occurs in somatic cells.
2. (B) It results in genetically identical daughter cells.
3. (C) The chromosome number is halved in daughter cells. ✓
4. (D) It results in the formation of two daughter cells.

4. At which stage of mitosis chromosomes line up in the centre?

1. (A) Prophase
2. (B) Metaphase ✓
3. (C) Anaphase
4. (D) Telophase

5. If you observe a cell in which nuclear membrane is reforming around two sets of chromosomes, what stage of cell cycle is this?

1. (A) Anaphase
2. (B) Telophase ✓
3. (C) Prophase
4. (D) Metaphase

6. Why is meiosis-II necessary after meiosis-I?

1. (A) To replicate chromosomes
2. (B) To reduce chromosome number
3. (C) To separate sister chromatids ✓
4. (D) To ensure genetic recombination

7. The cell cycle can be divided into two main phases, which are:

1. (A) interphase and the mitosis phase ✓
2. (B) prophase and metaphase
3. (C) G1 and G2
4. (D) meiosis-I and meiosis-II

8. Interphase lasts for about ____ of the total time of the cell cycle.

1. (A) 10%
2. (B) 50%
3. (C) 90% ✓
4. (D) 100%

9. The G1 phase is also called the:

1. (A) growth phase ✓
2. (B) synthesis phase
3. (C) division phase
4. (D) resting phase

10. Replication of DNA takes place in the:

1. (A) G1 phase
2. (B) S phase ✓
3. (C) G2 phase
4. (D) M phase

11. In which phase does the cell check for DNA damage and make necessary repairs?

1. (A) G1 phase
2. (B) S phase
3. (C) G2 phase ✓
4. (D) G0 phase

12. Which cells remain in the G0 phase for indefinite periods?

1. (A) Neurons ✓
2. (B) Epithelial cells
3. (C) Cells of the skin
4. (D) Cells of the intestine

13. Which cells do not enter G0 and continue to divide throughout life?

1. (A) Neurons
2. (B) Epithelial cells ✓
3. (C) Liver cells
4. (D) Kidney cells

14. In mitosis a cell divides into two daughter cells, each with ____ chromosomes as the parent cell.

1. (A) the same number of ✓
2. (B) half the number of
3. (C) double the number of
4. (D) no

15. The cell division of prokaryotes is called:

1. (A) binary fission ✓
2. (B) mitosis
3. (C) meiosis
4. (D) budding

16. The events of mitosis were discovered in the 1880s by the German biologist:

1. (A) Walther Flemming ✓
2. (B) Oscar Hertwig
3. (C) Robert Hooke
4. (D) Camillo Golgi

17. Karyokinesis means the division of the:

1. (A) nucleus ✓
2. (B) cytoplasm
3. (C) cell wall
4. (D) cell membrane

18. During which phase of mitosis do the nuclear envelope and nucleolus break down?

1. (A) Prophase ✓
2. (B) Metaphase
3. (C) Anaphase
4. (D) Telophase

19. Plant cells have no ____, so their mitotic spindle forms from spindle fibres present in the cytoplasm.

1. (A) centrosome ✓
2. (B) nucleus
3. (C) cell wall
4. (D) chromatin

20. Spindle fibres attach to chromosomes at the point of the centromere where special ____ proteins are present.

1. (A) kinetochore ✓
2. (B) tubulin
3. (C) actin
4. (D) keratin