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Cell Cycle and Cell Division

CBSE · Class 11 · Biology

Quick revision notes for Cell Cycle and Cell Division — CBSE Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

142 questions25 flashcards5 concepts

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Key Topics to Revise

1

Introduction to Cell Cycle

  • All organisms start from a single cell and grow through repeated cell divisions
  • Cell cycle is the sequence of events by which a cell duplicates its genome and divides into two daughter cells
  • Cell division involves DNA replication, cell growth, and actual division in a coordinated manner
2

Phases of Cell Cycle

  • Cell cycle has two main phases: Interphase and M Phase (Mitosis)
  • Interphase lasts 95% of cell cycle duration
  • M Phase includes nuclear division and cytoplasmic division
3

Mitosis (M Phase)

  • Mitosis is equational division - chromosome number remains same
  • Occurs in somatic diploid cells (except rare cases like male honey bees)
  • Plants can show mitosis in both haploid and diploid cells
4

Meiosis

  • Meiosis is reduction division - reduces chromosome number by half
  • Occurs in diploid cells destined to form gametes
  • Two sequential divisions: Meiosis I and Meiosis II

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Full Notes

Key Concepts

The cell cycle is the sequenceMitosis is the process of nuclearMeiosis is a specialized typeCrossing over is the exchangeCytokinesis is the division of cytoplasm

Frequently Asked Questions

What are the important topics in Cell Cycle and Cell Division for CBSE Class 11 Biology?
Cell Cycle and Cell Division covers several key topics that are frequently asked in CBSE Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Cell Cycle and Cell Division — CBSE Class 11 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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