Plant Cells

Overview of Plant Cells

  • Plant cells are eukaryotic cells with various organelles, each fulfilling specific functions.

Definitions

  • Organelle: A "small organ" within a cell that performs specific tasks.

Key Features of Plant Cells

  • Membrane-bound nucleus and organelles (e.g., mitochondria, endoplasmic reticulum).

  • Unique structural components:

    • Cellulose cell wall: Protects and provides shape, semi-rigid, allows material permeability.

    • Chloroplasts: Contain chlorophyll, responsible for photosynthesis, which converts CO2 to glucose using light energy.

    • Large central vacuole: Stores cell sap, waste products, ions, and contributes to cell growth and storage.

Major Organelles in Plant Cells

  • Mitochondria: Energy producers converting glucose into ATP.

  • Endoplasmic Reticulum (ER): Network of tubes; Rough ER has ribosomes; Smooth ER lacks ribosomes.

  • Nucleus: Contains the cell's DNA.

  • Cytoplasm: Watery medium with dissolved materials and organelles.

  • Amyloplast: Specialized plastid for storing starch (glucose polymer).

  • Ribosomes: Sites for protein synthesis by linking amino acids.

  • Golgi apparatus: Modifies, stores, and packages proteins.