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Leaves-Organs of Compromise

Discover the important traits a leaf must possess for survival, the consequences of these design needs, and explore examples of various leaves, stems, and roots. From photosynthesis formula to structural compromises, this overview uncovers the intricate balance of leaf biology.

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Leaves-Organs of Compromise

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  1. Leaves-Organs of Compromise

  2. Important traits a leaf must possess • A. Formula for photosynthesis • 1. broad flat and thin • 2. chloroplasts closes to sun • 3. moist exchange surfaces • 4. openings to allow gas in and out • 5. ample water • 6. system for product export

  3. B. Consequences of design needs • 1. fragile • 2. susceptible to predation • 3. easily dessicated • 4. structures that we will see are compromises between habitat that leaf is found in and the traits mentioned above

  4. II. Examples of leaves • A. Design Ligustrum leaf

  5. Cross section of Ligustrum leaf

  6. B. Zea leaf • 1. Growth characteristics • a. Vertical nature of plant • b. Hot dry sunny conditions • c. Difference between monocots and dicots • 2. Leaf structure

  7. Zea leaf

  8. C. Pinus needle • 1. Growth conditions • 2. Structure of needle

  9. Pine Needle

  10. What environment might the plant that possesses this leaf occupy? • Desert • High altitude mountain • Aquatic floater • Temperate forest

  11. III. Examples of stems • A. Dicot annual • Medicago

  12. Medicago stem cross section

  13. Higher power

  14. B. Dicot perennial • Tilia

  15. Tilia stem

  16. C. Zea Stem

  17. Zea stem

  18. Zea stem

  19. IV. Examples of roots • A. Dicot root Ranunculus

  20. Ranunculus root

  21. Ranunculus root

  22. Ranunculus root

  23. B. Zea root

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