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Cell Cycle and Cell Division — Revision Notes

CBSE · Class 11 · Biology

Cell Cycle and Cell Division revision notes for CBSE Class 11 Biology: 4 topics in quick points. Part of the CBSE Class 11 Biology syllabus.

151 questions76 flashcards5 concepts

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Key Topics to Revise

1

1. Cell Cycle and Interphase

  • Cell cycle has two basic phases: interphase and M phase.
  • Interphase is the phase between two successive M phases.
  • Interphase lasts more than 95% of the total cell cycle duration.
2

2. M Phase and Mitosis

  • M phase is the phase when actual cell division or mitosis occurs.
  • M phase begins with karyokinesis and usually ends with cytokinesis.
  • Mitosis is also called equational division because the chromosome number of the parent and progeny cells remains the same.
3

3. Cytokinesis and Special Cases

  • Cytokinesis is the division of cytoplasm into two daughter cells after karyokinesis.
  • In animal cells, cytokinesis occurs by a furrow in the plasma membrane.
  • In plant cells, cytokinesis occurs by cell-plate formation.
4

4. Meiosis I and Meiosis II

  • Meiosis is a reduction division that reduces chromosome number by half.
  • Meiosis occurs in diploid cells destined to form gametes.
  • Meiosis involves two sequential divisions: meiosis I and meiosis II.

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Full Notes

Key Concepts

The cell cycle is the orderedInterphase is the phase between twoG1 phase is the interval betweenS phase is the synthesis phaseG2 phase is the stage

Frequently Asked Questions

What are the important topics in Cell Cycle and Cell Division for CBSE Class 11 Biology?
Key topics in Cell Cycle and Cell Division include Cell Cycle and Interphase, M Phase and Mitosis, Cytokinesis and Special Cases, Meiosis I and Meiosis II. Study these first, then practise questions on each for Class 11 exams.
How should I revise Cell Cycle and Cell Division for Class 11 exams?
Learn the core ideas first, then work through the 151 practice questions on Cell Cycle and Cell Division. Revise definitions regularly and use flashcards for quick recall 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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