Cell - Structure and Functions

Science Class 8 : Chapter 08

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Quick Revision : Cell - Structure and Functions

  • Discovery of Cell: Robert Hooke discovered cells in 1665 while observing cork under a microscope.
  • Cell Theory: All living organisms are made of cells, which are the basic structural and functional units.
  • Types of Organisms: Unicellular (single cell) and Multicellular (many cells).
  • Cell Components: Cell membrane, cytoplasm, and nucleus are the basic parts of a cell.
  • Cell Shape and Size: Cells vary in shape (spherical, spindle-shaped, branched) and size (0.1 ΞΌm to 170 mm).
  • Plant vs Animal Cells: Plant cells have cell wall and chloroplasts; animal cells do not.
  • Prokaryotic vs Eukaryotic: Prokaryotes lack nuclear membrane; eukaryotes have well-defined nucleus.
  • Cell Functions: Cells perform all life processes: nutrition, respiration, excretion, reproduction.

Questions

Chapter Summary : Cell - Structure and Functions

What You Will Learn: This chapter covers the discovery of cells, types of cells, cell structure and functions, comparison of plant and animal cells, prokaryotic and eukaryotic cells, and the importance of cells as basic units of life.

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