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Cell: The Unit of Life

ICSE · Class 11 · Biology

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

104 questions48 flashcards5 concepts

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A detailed, labeled diagram of a typical prokaryotic cell, such as a bacterium, showing its major components like cell envelope (glycocalyx, cell wall, plasma membrane), nucleoid, plasmid, flagellum,
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Key Topics to Revise

1

1. Cell as the Basic Unit of Life

  • All living beings are made of cells.
  • In unicellular organisms, one cell performs all life functions.
  • In multicellular organisms, cells are specialised and work together.
2

2. Historical Development and Cell Theory

  • Robert Hooke published Micrographia in 1665 and coined the term cells after observing cork under a primitive microscope.
  • Hooke saw dead cell walls and vacant spaces, not living cells.
  • Malpighi observed cells earlier and called them saccules and utricles.
3

3. Prokaryotic and Eukaryotic Cells

  • Prokaryotic cells are characteristic of bacteria, cyanobacteria, mycoplasma, and PPLO.
  • Eukaryotic cells are found in all organisms other than bacteria and cyanobacteria.
  • Prokaryotic cells are simple in morphology and lack membrane-bound organelles.
4

4. Plant Cell and Animal Cell

  • Plant cells usually have a cell wall made of cellulose.
  • Animal cells generally do not have a cell wall.
  • Plastids are present in most plant cells but absent in animal cells.

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Full Notes

Key Concepts

A cell is the fundamental structuralSchleiden and Schwann gave coherenceViruses are acellular and lack cellularProkaryotic cells are simple in structureEukaryotic cells are found in all

Frequently Asked Questions

What are the important topics in Cell: The Unit of Life for ICSE Class 11 Biology?
Key topics in Cell: The Unit of Life include Cell: The Unit of Life — Complete Concept Map, Cell Structure and Organization - Comprehensive Overview, Cell Structure Organization and Hierarchy. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Cell: The Unit of Life — ICSE Class 11 Biology?
Understand the core concepts first, then work through the 104 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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