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Cell : The Unit of Life

CBSE · Class 11 · Biology

Quick revision notes for Cell : The Unit of Life — CBSE Class 11 Biology. Key concepts, formulas, and definitions for last-minute revision.

98 questions90 flashcards5 concepts

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Key Topics to Revise

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1. Cell and Cell Theory

  • A cell is the fundamental structural and functional unit of all living organisms.
  • Unicellular organisms perform all life functions within one cell.
  • Multicellular organisms are made of many cells, and cells may specialize for different functions.
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2. Prokaryotic Cells

  • Prokaryotic cells are represented by bacteria, blue-green algae, mycoplasma, and PPLO.
  • They are generally smaller and multiply more rapidly than eukaryotic cells.
  • The four basic shapes of bacteria are bacillus, coccus, vibrio, and spirillum.
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3. Eukaryotic Cells and Cell Organelles

  • Eukaryotic cells are found in protists, plants, animals, and fungi.
  • They have an organised nucleus with a nuclear envelope and many membrane-bound organelles.
  • Plant cells have a cell wall, plastids, and a large central vacuole.
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4. Quick Comparison Points

  • Prokaryotes are smaller and simpler; eukaryotes are larger and more compartmentalised.
  • Prokaryotes lack a membrane-bound nucleus; eukaryotes possess one.
  • Prokaryotes have 70S ribosomes; eukaryotic cytoplasm has 80S ribosomes.

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Full Notes

Key Concepts

A cell is the smallest unitMatthias Schleiden observed that all plantsProkaryotic cells are found in bacteriaEukaryotic cells are found in protistsThe plasma membrane is selectively permeable

Frequently Asked Questions

What are the important topics in Cell : The Unit of Life for CBSE Class 11 Biology?
Cell : The Unit of Life 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 : The Unit of Life — CBSE Class 11 Biology?
Understand the core concepts first, then work through the 98 practice questions available for this chapter. Revise formulas and 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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