Leaves: Plant Structures and Functions

Leaves: Plant Structures and Functions

  • Leaves are essential plant structures with various functions.

Leaf Structures

  1. Petiole (Leaf Stem):

    • Also known as the leaf stem.
    • Contains xylem and phloem, which are crucial for transporting water and nutrients.
    • Attaches leaves to stems.

  2. Leaf Blade (Lamina):

    • The main part of the leaf.
    • Important for photosynthesis and gas exchange.

  3. Vein:

    • Supports the leaf blade.
    • Transports water and nutrients throughout the leaf.
  • Leaves vary in shapes and sizes depending on their native environment.

Leaf Tissues

  • Leaves are composed of several tissues:
    • Waxy Cuticle
    • Mesophyll
      • Air Space
      • Upper Epidermis
      • Palisade Mesophyll
      • Spongy Mesophyll
      • Guard Cells
      • Stomata