Cell Cycle & Cell Division — NEET PYQ
20 previous year questions on Cell Cycle & Cell Division for NEET Biology. Filter by year, solve each MCQ, and review detailed solutions.
Cell Cycle & Cell Division in NEET — Weightage & What Actually Gets Asked
Cell Cycle & Cell Division (NCERT Class 11 Biology, Unit "Cell Structure & Function") is one of the best return-on-effort chapters in NEET Biology: the NCERT chapter is short, yet NEET has asked from it almost every year — typically 2–3 questions, occasionally more. The questions are concept-stable (they repeat the same handful of ideas in new wording), so working through past papers is the single fastest way to lock these marks.
| NEET question frequency | ~2–3 questions most years (rarely 0) |
| NCERT source | Class 11, Ch. on Cell Cycle & Cell Division |
| Difficulty | Easy–Moderate; mostly direct recall |
| Best use of time | High — short chapter, reliable marks |
High-Yield Sub-Topics (most-asked first)
- Prophase I sub-stages of meiosis. The most repeated theme. Order is Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis. Synapsis (pairing) happens in zygotene, crossing over in pachytene, and chiasmata become visible in diplotene. Expect "in which stage does X happen" almost every year.
- Chromosome (n) vs DNA content (C) bookkeeping. After S phase the chromosome number is unchanged (2n) but DNA doubles (2C → 4C). Meiosis I is reductional (2n → n, 4C → 2C); meiosis II is equational (n stays, 2C → 1C). A "how many chromosomes/DNA molecules after meiosis I" question is a NEET favourite.
- Cell cycle phases & checkpoints. S phase = DNA replication; interphase is ~95% of cycle time and M phase only ~5%. The spindle assembly checkpoint operates at metaphase (gating entry to anaphase), NOT at G2/M. G0 is the quiescent phase — neurons and mature RBCs stay there.
- Mitosis vs meiosis & cytokinesis. Mitosis → 2 identical diploid cells (growth/repair); meiosis → 4 genetically different haploid cells (gametes, variation). Plant cytokinesis is by cell-plate formation; animal cells use a cleavage furrow.
- Spindle apparatus & colchicine. Spindle fibres are microtubules (tubulin). Colchicine blocks tubulin polymerisation, preventing spindle formation and arresting cells at metaphase — a recurring single-fact question.
Common Mistakes Students Make
- Mixing up the prophase I stages. Synapsis (zygotene), crossing over (pachytene) and visible chiasmata (diplotene) are three different stages — a mnemonic like "Lazy Zebras Pull Down Diakinesis" keeps the order straight.
- Confusing chromosome number (n) with DNA content (C). After S phase the cell is still 2n but already 4C — the number of chromosomes only falls in meiosis I.
- Placing the spindle assembly checkpoint at G2/M. It acts at metaphase, ensuring every kinetochore is attached before anaphase begins.
- Saying crossing over is between sister chromatids — it is between non-sister chromatids of homologous chromosomes.
Frequently Asked Questions
How many questions come from Cell Cycle and Cell Division in NEET?
Usually 2–3 questions almost every year, and they rarely skip the chapter entirely. Because the NCERT chapter is short, the marks-per-page of study is among the highest in Class 11 Biology — which is exactly why it is worth drilling the PYQs.
What is the most important topic in Cell Cycle and Cell Division for NEET?
The sub-stages of Prophase I of meiosis (leptotene to diakinesis) — what happens in each, especially synapsis (zygotene), crossing over (pachytene) and chiasmata (diplotene). It is the single most repeated theme, followed by chromosome/DNA bookkeeping across meiosis I and II.
What is the correct order of the stages of Prophase I?
Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis. Pairing of homologous chromosomes (synapsis) is in zygotene, crossing over in pachytene, chiasmata become visible in diplotene, and terminalisation completes in diakinesis.
Is Cell Cycle and Cell Division an easy chapter for NEET?
Yes — it is short, mostly direct-recall, and concept-stable (questions repeat the same ideas in new wording). The few traps are about stage order and the chromosome-number vs DNA-content distinction. Solving past-year questions almost guarantees these marks.
More Chapters in Cell Structure & Function
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