Chapter 10: Cell Cycle
NCERT Solutions for CBSE Class 10 Biology — 19 solved questions with detailed explanations.
Solved Questions
Q1. During which phase of mitosis do chromosomes align at the equatorial plate?
- Prophase
- Metaphase
- Anaphase
- Telophase
Difficulty: Easy · Topic: Mitosis
Solution
Metaphase: chromosomes align at the metaphase plate (cell equator), attached to spindle fibers at kinetochores.
Q2. Meiosis results in:
- 2 diploid cells
- 4 haploid cells
- 4 diploid cells
- 2 haploid cells
Difficulty: Easy · Topic: Meiosis
Solution
Meiosis: one diploid cell → 4 haploid cells (through two divisions: meiosis I and II).
Q3. Cytokinesis in animal cells occurs by:
- fragmentation
- cleavage furrow
- budding
- cell plate
Difficulty: Easy · Topic: Cell Cycle
Q4. G0 phase is:
- quiescent phase (cell not dividing)
- gap phase
- mitotic phase
- synthesis phase
Difficulty: Easy · Topic: Cell Cycle
Solution
quiescent phase (cell not dividing).
Q5. G1 phase prepares for:
- DNA synthesis
- cell division
- cytokinesis
- meiosis
Difficulty: Easy · Topic: Cell Cycle
Q6. G2 phase prepares for:
- DNA synthesis
- mitosis
- G1
- S phase
Difficulty: Easy · Topic: Cell Cycle
Q7. Prophase involves:
- chromosome condensation, spindle formation
- cell plate formation
- cytokinesis
- DNA replication
Difficulty: Easy · Topic: Cell Cycle
Solution
chromosome condensation, spindle formation.
Q8. Anaphase involves:
- chromosome condensation
- separation of sister chromatids
- DNA replication
- nuclear envelope reformation
Difficulty: Easy · Topic: Cell Cycle
Solution
separation of sister chromatids.
Q9. Telophase involves:
- chromosome condensation
- spindle formation
- DNA replication
- nuclear envelope reformation, decondensation
Difficulty: Easy · Topic: Cell Cycle
Solution
nuclear envelope reformation, decondensation.
Q10. Meiosis I separates:
- sister chromatids
- DNA strands
- organelles
- homologous chromosomes
Difficulty: Easy · Topic: Cell Cycle
Solution
homologous chromosomes.
Q11. Meiosis II separates:
- organelles
- DNA strands
- homologous chromosomes
- sister chromatids
Difficulty: Easy · Topic: Cell Cycle
Solution
sister chromatids.
Q12. Synapsis occurs during:
- metaphase I
- pachytene
- diplotene
- zygotene of prophase I
Difficulty: Easy · Topic: Cell Cycle
Solution
zygotene of prophase I.
Q13. Chiasmata are visible during:
- diplotene of prophase I
- pachytene
- metaphase
- zygotene
Difficulty: Easy · Topic: Cell Cycle
Solution
diplotene of prophase I.
Q14. Crossing over occurs during:
- Prophase I (pachytene)
- Metaphase I
- Anaphase I
- Prophase II
Difficulty: Easy-Medium · Topic: Crossing Over
Solution
Crossing over (recombination) occurs during pachytene stage of prophase I, between non-sister chromatids of homologous chromosomes.
Q15. S phase of cell cycle involves:
- DNA replication
- protein synthesis
- cell division
- RNA synthesis only
Difficulty: Easy-Medium · Topic: Cell Cycle
Q16. G1 phase is characterized by:
- cytokinesis
- cell growth and preparation for DNA synthesis
- mitosis
- DNA replication
Difficulty: Easy-Medium · Topic: Cell Cycle
Solution
cell growth and preparation for DNA synthesis.
Q17. Cytokinesis in plant cells occurs by:
- cleavage furrow
- cell plate formation
- fragmentation
- budding
Difficulty: Easy-Medium · Topic: Cell Cycle
Solution
cell plate formation.
Q18. The longest phase of cell cycle is:
- prophase
- anaphase
- metaphase
- interphase
Difficulty: Easy-Medium · Topic: Cell Cycle
Q19. Spindle fibers are made of:
- tubulin protein
- actin
- myosin
- keratin
Difficulty: Easy-Medium · Topic: Cell Cycle
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