MODULE 8: TRANSPIRATION AND PHOTOSYNTHESIS

• TRANSPIRATION - transport of water and minerals absorbed by the roots to the leaves to be used for photosynthesis through the xylem cels ni an upward direction only.
• Factors Affecting Transpiration

  • Environmental factors
  • Physiological Adaptations
  • Structural Adaptations
• Environmental factors

  • Atmospheric humidity
  • Internal concentration of carbon dioxide in leaves
  • Air movement
  • Air temperature
  • Availability of water ni the soil
  • light
• Physiological Adaptations

  • Water-use efficiency
  • Leaf abscission
  • Dormancy
  • Leaf position
  • Stomatal cycling
  • Circadians rhythms
  • Synthesis of abscisic acid
• Structural Adaptations Presence of cuticle

  • Trichomes
  • Suncken stomata
  • Decreased leaf arca
• Structural Adaptations Presence of cuticle

  • Trichomes
  • Suncken stomata
  • Decreased leaf arca
• PHOTOSYNTHESIS - the process by which plants and other photosynthetic organisms utilize and convert light energy and inputs of water and carbon dioxide into chemical energy in the form of sugar. It is Series chemical reaction that occurs inside the Chloroplast, aspecial cel organele which contains pigments caled Chlorophyl that captures light energy from the sun.
• Two Major Photosynthetic Reactions

  Light Dependent Reaction

  • First major steps in the conversion of light energy to biochemical energy in the form of ATP and NADPH
  • requires sunlight that is captured by the thylakoid inside the chloroplast

  Light Independent Reactions

  • Completes the conversion of light energy to biochemical energy in the form of sugar.
  • Requires the products produced by the light dependent reaction to function in the stroma of the chloroplast.
• • The products produced after Light Independent Reaction were Oxygen, ATP and NADPH.
  • ATP and NADPH produced by the Light Independent Reaction, together with the Carbon Dioxide harvested by the stomata from the air, were needed ot proceed with Light Independent reactions.
  • After two cycles of the Light Independent Reaction, one molecule of glucose was produced.
• Tomato (Solanum lycopersicum)
• Digman (Hydrilla spp. or Elodea spp)
• 1. Light Dependent
  2. Light Independent
  3. Light
  4. Granum
  5. Outer membrane
  6. Inner Membrane
  7. H2O
  8. O2
  9. Thylakoid
  10. stroma
  11. O2
  12. G3P
  13. Chloroplast