GCSE Biology (AQA)

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Leaves

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Organisation Plant Tissues, Organs and Systems

Leaves

5:04 Plant Leaf Structures
Spec 4.2.3.1 4.1.3.1
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  • Multicellular plants have specialized cells organized into tissues, organs, and organ systems.
  • Understanding the organization of multicellular plants and animals is essential, including definitions of cells, tissues, and organs.
  • Cells are the basic building blocks, tissues are groups of similar cells, and organs are collections of tissues with specific functions.
  • Leaves are plant organs primarily responsible for photosynthesis and controlling water flow.
  • Observing leaf tissues requires examining a cross-section under a microscope.
  • Leaf tissues include the upper epidermis, palisade mesophyll, spongy mesophyll, and lower epidermis.
  • The upper and lower epidermis contain epidermal tissue, which is transparent to allow light for photosynthesis and protects the leaf with a waxy cuticle.
  • The palisade mesophyll is adapted for light absorption and contains chloroplasts for photosynthesis.
  • The spongy mesophyll facilitates gas exchange and has a large surface area with air gaps.
  • Xylem and phloem form the vascular bundle, transporting water and nutrients within the plant.
  • Understanding the structure and function of these tissues is crucial for explaining their roles in plant physiology.

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