1. The Tree
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2. treelafayette.org http://hosstreefarm.com/tree-stock.html

3. The roots
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4. Lateral root buds Root hairs Root cap treelafayette.org Function:
Lateral root buds
Root hairs
Function:
Anchorage and support
Water and mineral absorption
Nutrient storage
Depth: roots grow about as wide as the crown, but they do not grow very deep when water is available via rain or irrigation.
Lateral roots: these roots branch out to collect water and nutrients. They also provide support.
Root hairs: These hairs increase the surface area of the root. This increases the ability of the root to absorb water and nutrients. It is far less costly than developing more lateral roots.
Root cap: this protects the root tip from damage as it grows. The root cap produces cells the act like a lubricant. As the root grows , cells are shed and more are produced.
Root cap
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5. The stem
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6. Outer bark Inner bark Cambium Sapwood Heartwood treelafayette.org
Function:
Support the crown
Store water, carbohydrates, and minerals
Conduct water and minerals between the crown and roots
Outer bark: This tissue is dead, and it provides protection from disease and pests.
Inner bark: This tissue is living and called the phloem. It transports sugars.
Cambium: This tissue grows to increase the diameter of the tree.
Sapwood: this is the youngest wood (called xylem). It conducts sap and water, provides support, and stores nutrients.
Heartwood: this is the oldest wood. Once this tissue was the sapwood, but over time it because dark and dead. This wood only provides support; it is no longer used for transportation.
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7. treelafayette.org Tree Rings:
Tree Rings:
Early wood: large cells with thin cell walls
Late wood: small cells with thick cell walls
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8. The leaves
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9. treelafayette.org Function: Site of photosynthesis Regulate water
Function:
Site of photosynthesis
Regulate water
Houses nutrients
Angiosperms: broad leaf trees
Cuticle: a waxy waterproof layer. The cuticle tends to be thin in the shade and thick in the sun
Stomata: microscopic openings generally only on the underside of the leaf (except poplars, for example). These are flanked by guard cells that swell to close the stomate. Water moves out of the stomata, and CO2 moves in.
Mesophyll: chloroplasts (the site of photosynthesis) are located here. Carbohydrates, water, and minerals are transported through veins in the mesophyll tissue. The vein consists of xylem and phloem.
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10. Photosynthesis
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11. CO2 + H2O  C6H12O6 + O2
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12. Chloroplasts treelafayette.org
Chloroplasts
Chloroplasts: the location of photosynthesis. Thylakoids contain protein and pigments (chlorophyll) that absorb sunlight. Grana are stacks of thylakoids.
Why are leaves green?
Absorption spectrum.
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13. treelafayette.org
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