CBSE · Class 9 · Science · Chapter 2

Cell: The Building Block of Life

Explore the structure of cells, their major components and how each part helps living organisms function.

9 lessons 45 min
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Lessons in this chapter

  1. 1How to Study Cell?Studying cells requires microscopes because cells stubbornly refuse to pose for the naked eye.
  2. 2Structure of a CellA cell is a tiny organised workplace where every structure has a job and none gets a lunch break.
  3. 3Cell wall — The outer covering of cellsPlant cells bring their own walls because standing upright all day is serious work.
  4. 4The Cell Interior — A Coordinated Working SystemThree cell designs enter the microscope, and their internal layouts tell the whole story.
  5. 5Why do Eukaryotic Cells Need These Organelles?The cell’s organelles run a factory where nobody gets to skip their assigned job.
  6. 6Mitochondria — The Powerhouse of The CellMitochondria power the place while plastids and vacuoles handle food, colour and storage.
  7. 7How do Normal Cells Grow and Divide?Cells divide with impressive discipline—until the rules are ignored.
  8. 8Cell Theory — The Unifying Principle of BiologyThree scientists compare notes and biology gains one unifying idea.
  9. 9Chapter Summary and PracticeEvery membrane, organelle and division returns for one final cellular reunion.
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