50 Most Important NEET PYQs of Chapter 10: Cell Cycle and Cell Division – Part 2 (Q26–50) | By neetpyqall

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 🧬 50 Most Important NEET PYQs of Chapter 10: Cell Cycle and Cell Division – Part 2 (Q26–50) | By neetpyqall

Here’s the second part of the most important NEET questions from Chapter 10 – Cell Cycle and Cell Division, with clear and student-friendly explanations. Let’s jump right in! 🚀

26. Which of the following best describes the function of the G2 phase?

A) DNA synthesis
B) Mitosis preparation
C) Cell plate formation
D) Chromosome separation
✅ Answer: B) Mitosis preparation
📘 Explanation: G2 is the phase where the cell prepares for mitosis by producing proteins and enzymes needed for division.

27. In meiosis, how many daughter cells are produced from one parent cell?

A) 2 diploid cells
B) 4 haploid cells
C) 4 diploid cells
D) 2 haploid cells
✅ Answer: B) 4 haploid cells
📘 Explanation: One meiotic division results in four genetically distinct haploid cells.

28. In which meiotic phase does the disjunction of sister chromatids occur?

A) Anaphase I
B) Metaphase I
C) Anaphase II
D) Telophase I
✅ Answer: C) Anaphase II
📘 Explanation: Sister chromatids are separated during anaphase II of meiosis.

29. Which checkpoint ensures DNA is properly replicated before mitosis?

A) G1/S checkpoint
B) M checkpoint
C) G2/M checkpoint
D) S/G2 checkpoint
✅ Answer: C) G2/M checkpoint
📘 Explanation: G2/M checkpoint ensures the cell enters mitosis only after accurate DNA replication.

30. In a dividing cell, nuclear envelope disappears in:

A) Telophase
B) Prophase
C) Anaphase
D) Cytokinesis
✅ Answer: B) Prophase
📘 Explanation: During prophase, the nuclear envelope breaks down to allow spindle interaction with chromosomes.

31. The mitotic spindle is made up of:

A) Microfilaments
B) Intermediate filaments
C) Microtubules
D) Chromatin
✅ Answer: C) Microtubules
📘 Explanation: Microtubules form the spindle apparatus that separates chromosomes during cell division.

32. During which stage does the cell grow and carry out its normal functions?

A) M phase
B) S phase
C) G1 phase
D) G2 phase
✅ Answer: C) G1 phase
📘 Explanation: G1 is the phase of active metabolism and growth before DNA synthesis.

33. Centrosomes move to opposite poles during:

A) Telophase
B) Metaphase
C) Prophase
D) Anaphase
✅ Answer: C) Prophase
📘 Explanation: Centrosomes move to the poles during prophase to help form the mitotic spindle.

34. Spindle fibers attach to chromosomes during:

A) Prophase
B) Metaphase
C) Telophase
D) Interphase
✅ Answer: B) Metaphase
📘 Explanation: In metaphase, spindle fibers attach to kinetochores and align chromosomes at the equator.

35. What is true for telophase of mitosis?

A) Chromosomes line up at equator
B) Chromatids separate
C) Spindle fibers disappear
D) DNA replication occurs
✅ Answer: C) Spindle fibers disappear
📘 Explanation: In telophase, chromosomes decondense and spindle fibers disassemble.

36. Meiosis II is similar to:

A) Mitosis
B) Meiosis I
C) DNA replication
D) None of these
✅ Answer: A) Mitosis
📘 Explanation: Meiosis II is an equational division, like mitosis, where sister chromatids are separated.

37. Interkinesis occurs between:

A) Meiosis I and II
B) Mitosis and cytokinesis
C) G1 and S phase
D) Anaphase and telophase
✅ Answer: A) Meiosis I and II
📘 Explanation: Interkinesis is a short resting phase between the two meiotic divisions without DNA replication.

38. What holds homologous chromosomes together during synapsis?

A) Chromatids
B) Centrosomes
C) Synaptonemal complex
D) Spindle fibers
✅ Answer: C) Synaptonemal complex
📘 Explanation: The synaptonemal complex is a protein structure that holds homologous chromosomes together.

39. The duration of the M phase is:

A) Shortest phase
B) Longest phase
C) Same as G1
D) Equal to G2
✅ Answer: A) Shortest phase
📘 Explanation: M phase is rapid and short compared to the longer interphase phases.

40. Reduction in chromosome number happens during:

A) Mitosis
B) Meiosis I
C) Meiosis II
D) G1 phase
✅ Answer: B) Meiosis I
📘 Explanation: Meiosis I reduces the chromosome number from diploid to haploid.

41. Tetrad formation occurs in:

A) Prophase I
B) Metaphase II
C) Anaphase I
D) Telophase I
✅ Answer: A) Prophase I
📘 Explanation: Tetrads are formed during synapsis in prophase I.

42. Chiasmata are first seen in:

A) Leptotene
B) Zygotene
C) Pachytene
D) Diplotene
✅ Answer: D) Diplotene
📘 Explanation: Chiasmata are visible in diplotene after crossing over occurs in pachytene.

43. In which cell cycle phase is the DNA content doubled?

A) G1
B) S phase
C) G2
D) M phase
✅ Answer: B) S phase
📘 Explanation: DNA replication occurs in S phase, doubling the DNA content.

44. The mitotic apparatus begins to form during:

A) G1 phase
B) S phase
C) Prophase
D) Metaphase
✅ Answer: C) Prophase
📘 Explanation: Spindle apparatus begins forming early in prophase.

45. Which cells in human females remain arrested in diplotene until puberty?

A) Spermatocytes
B) Primary oocytes
C) Secondary oocytes
D) Ovum
✅ Answer: B) Primary oocytes
📘 Explanation: Primary oocytes remain in diplotene of prophase I until hormonal changes at puberty trigger ovulation.

46. Terminalization occurs during:

A) Pachytene
B) Zygotene
C) Diakinesis
D) Leptotene
✅ Answer: C) Diakinesis
📘 Explanation: Terminalization is the final separation of chiasmata in diakinesis.

47. Crossing over leads to:

A) Mutation
B) Recombination
C) DNA replication
D) Spindle formation
✅ Answer: B) Recombination
📘 Explanation: Crossing over results in genetic recombination and variation.

48. Cytokinesis in animal cells begins during:

A) Metaphase
B) Prophase
C) Anaphase
D) Telophase
✅ Answer: C) Anaphase
📘 Explanation: The cleavage furrow begins to form during late anaphase.

49. Cell division without cell growth results in:

A) Increase in cell size
B) Decrease in cell size
C) No change in size
D) Cell death
✅ Answer: B) Decrease in cell size
📘 Explanation: Repeated divisions without growth reduce the size of daughter cells.

50. The main function of meiosis is:

A) Growth
B) Repair
C) Genetic stability
D) Gamete formation
✅ Answer: D) Gamete formation
📘 Explanation: Meiosis produces haploid gametes essential for sexual reproduction.

🎉 That wraps up all 50 NEET PYQs for Chapter 10 – Cell Cycle and Cell Division!

📚 Want to explore more NEET biology chapters? Check out:
🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com


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