I. 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
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
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
What environment might the plant that possesses this leaf occupy?
1. Desert
2. High altitude mountain
3. Aquatic floater
4. Temperate forest
Medicago stem cross section