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Cell :The Building Block of Life

CBSE · Class 9 · Science

Complete topic list for Cell :The Building Block of Life in CBSE Class 9 Science. Key concepts, sub-topics, and what to focus on for board exams.

84 questions90 flashcards5 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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4 Topics · CBSE Class 9 Science

Topics in Cell :The Building Block of Life

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.

Key Concepts

Central concept: Cell as the basic structural and functional unit of life

Discovery of the cellCell size and measurementCell membraneOsmosis and diffusionCell wallTypes of cellsCell interiorNucleus and genetic material

Frequently Asked Questions

What are the important topics in Cell :The Building Block of Life for CBSE Class 9 Science?
Cell :The Building Block of Life covers several key topics that are frequently asked in CBSE Class 9 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 Building Block of Life — CBSE Class 9 Science?
Understand the core concepts first, then work through the 84 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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