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Cell :The Building Block of Life — Revision Notes

CBSE · Class 9 · Science

Cell :The Building Block of Life revision notes for CBSE Class 9 Science: 4 topics in quick points. Part of the CBSE Class 9 Science syllabus.

84 questions90 flashcards3 formulas & key relations5 concepts

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A hierarchical flowchart illustrating the complete classification of matter, starting from 'Matter' and branching into 'Physical Classification' (Solids, Liquids, Gases, Plasma, Bose-Einstein Condensa
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Key Topics to Revise

1

1. Discovery and Study of Cells

  • The human eye can clearly distinguish two points separated by 0.1 mm at 25 cm, which is the limit of resolution.
  • A cell is too small to be seen clearly without a microscope.
  • Robert Hooke observed cork cells in 1665 using a self-designed microscope with about 200–300X magnification and named them cells.
2

2. Cell Membrane, Osmosis, and Cell Wall

  • The cell membrane is a thin boundary that surrounds the cell and protects its contents.
  • It is also called the plasma membrane.
  • The cell membrane is selectively permeable, so it allows some substances to pass through but blocks others.
3

3. Prokaryotic and Eukaryotic Cells

  • A bacterial cell lacks a well-defined nucleus and membrane-bound organelles.
  • Such cells are called prokaryotic cells.
  • Plant and animal cells have a well-defined nucleus and membrane-bound organelles.
4

4. Cell Interior and Cell Organelles

  • The main parts of a cell are the cell membrane, cytoplasm, and nucleus.
  • The cytoplasm is a semi-fluid, jelly-like substance.
  • Cell organelles in the cytoplasm perform specific jobs.

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Full Notes

Key Concepts

Robert Hooke observed cork cellsThe human eye cannot clearly separateThe cell membrane is a thinDiffusion is the net movementPlant

Frequently Asked Questions

What are the important topics in Cell :The Building Block of Life for CBSE Class 9 Science?
Key topics in Cell :The Building Block of Life include Discovery and Study of Cells, Cell Membrane, Osmosis, and Cell Wall, Prokaryotic and Eukaryotic Cells, Cell Interior and Cell Organelles. Study these first, then practise questions on each for Class 9 exams.
How should I revise Cell :The Building Block of Life for Class 9 exams?
Learn the core ideas first, then work through the 84 practice questions on Cell :The Building Block of Life. 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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All CBSE Class 9 Science Revision Notes

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