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Cell - The Unit of Life

ICSE · Class 9 · Biology

Quick revision notes for Cell - The Unit of Life — ICSE Class 9 Biology. Key concepts, formulas, and definitions for last-minute revision.

42 questions38 flashcards5 concepts

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A comparison chart highlighting key differences between prokaryotic and eukaryotic cells, including nucleus, membrane-bound organelles, size, ribosomes, and DNA structure.
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Key Topics to Revise

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1. Cell as the Basic Unit of Life

  • A cell is the smallest part of the body of an organism capable of independent existence and performing essential functions of life.
  • The cell is the fundamental structural and functional unit of all living beings.
  • All organisms including humans start life as a single cell called the egg.
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2. Invention of the Microscope and Discovery of Cells

  • The first microscope was constructed by Antony van Leeuwenhoek.
  • His microscope was a simple microscope with a single biconvex lens.
  • It had magnifying power up to 200 times.
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3. Cell Theory

  • Matthias Schleiden said every plant is made up of a large number of cells.
  • Theodor Schwann made similar discoveries in animals.
  • Cell theory was proposed by Schwann and Schleiden in 1839.
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4. Number, Size, and Shape of Cells

  • Larger an organism, greater the number of cells in its body.
  • Single-celled examples include bacteria, yeast, and amoeba.
  • Few-celled examples include Spirogyra and Volvox.

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Full Notes

Key Concepts

A cell is the smallest partAntony van Leeuwenhoek constructed the firstThe cell theory states three majorProkaryotic cells do not haveThe cell membrane is living

Frequently Asked Questions

What are the important topics in Cell - The Unit of Life for ICSE Class 9 Biology?
Key topics in Cell - The Unit of Life include Cell - The Unit of Life: Complete Concept Map, Cell Organelles — Complete Overview, Cell Organelles - Overview Mind Map. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Cell - The Unit of Life — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 42 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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