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Forestry Science Day 2 Ms. Dombroski August 2005

Forestry Science Day 2 Ms. Dombroski August 2005. http://www.cpluhna.nau.edu/images/mixedconifer.jpg. What is a Tree? A woody plant having one well-defined stem and a formal crown. Also, a tree usually attains a height of 8 feet. http://www.flmnh.ufl.edu/anthro/caribarch/images/danceiba.jpg.

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Forestry Science Day 2 Ms. Dombroski August 2005

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  1. Forestry Science Day 2Ms. DombroskiAugust 2005 http://www.cpluhna.nau.edu/images/mixedconifer.jpg

  2. What is a Tree? A woody plant having one well-defined stem and a formal crown. Also, a tree usually attains a height of 8 feet. http://www.flmnh.ufl.edu/anthro/caribarch/images/danceiba.jpg

  3. Tree Parts What are the Three Main parts of a tree and What are Their Functions? 1. Crown: Manufactures food 2. Stem: Transports food, minerals, & water up and down the plant 3. Roots: Absorb water and minerals and transport them up through the stem to the crown.

  4. Main Parts of a Tree

  5. Stem Parts What are the parts of the stem and their functions? • Heartwood: Dead wood located in the center of the stem. Provides strength to the tree. • Phloem: Food conducting tissue • Xylem: Supporting and water-conducting tissue

  6. Stem Parts • Cambium: An active layer of cells located between the xylem and phloem. Responsible for the annual growth of the tree. • Sapwood: Newly formed wood between cambium and the heartwood • Bark: Outer surface that protects the cambium, phloem, and xylem.

  7. Springwood - Young, usually soft wood that lies directly beneath the bark and develops in early spring. Summerwood - produced during the latter part of the growing season and is harder and less porous than springwood. Growth Rings http://www.idahoforests.org/img/cookie2.gif Division of Cambium = Rings

  8. Tree Cookies! • In groups of two you will need; • A handout and writing utensil • A tree cookie • 5 pins • 5 pieces of tape • You will be sharing, diameter tape and Biltmore sticks

  9. Why do Annual Rings vary in Width? 1. Competition for necessities 2. The amount of supply 3. Human interruption – selective cutting 4. Natural Disasters - fires, insect damage, etc.

  10. Tree Canopy • What is the main function of the canopy?

  11. What is the Process of Photosynthesis? • The process whereby carbohydrates (sugars and starches) are manufactured in the leaves of green plants using water, carbon dioxide, and in the presence of sunlight. 6H2O + 6CO2 ----------> C6H12O6+ 6O2 http://www.cafeaulait.org/course/week9/sun.gif

  12. http://www.caribbeanedu.com/images/kewl/photosynthesis.gif

  13. Complete flower? Contains pistil, stamen, sepals and petals (monoecious) Incomplete flower? A flower that lacks a specific part; a pistil, stamen, sepals, or petals (dioecious) Monoecious flowers contain both the male and female reproductive parts. Dioecious flowers the male and female flower parts are produced on separate trees What's in the Tree Crown?

  14. Parts of the Flower http://www.ecy.wa.gov/programs/wq/plants/plantid2/images/flowerwes.gif

  15. Flower Dissection Lab • In groups of two you will need; • One handout, writing utensil • One flower • One tweezers • One blunt/sharp scissor • Microscope slide and cover slip • Several pins • Tape • One dissection tray

  16. How do Trees Reproduce? 1. Seeds – Most trees reproduce by this method 2. Sprouts 3. Suckers http://www.colostate.edu/Depts/CoopExt/4DMG/images/sucker2.jpg

  17. PARTS 1. Seed coat - protection 2. Embryo – organism in early development 3. Stored food a. Endosperm: Nutritive tissue of flowering plants b. Cotyledons: first pair of leaves to emerge TYPES 1. Monocotyledon: Flowering plants (grasses, orchids, and lilies) having a single cotyledon in the seed. 2. Dicotyledon: A flowering plant with two embryonic seed leaves What about Seeds?

  18. Parts of the Seed

  19. 3 Main Types of Roots • Tap - large and fleshy, grow deep, able to store food (necessary for perennial plants), mostly found in dicotyledons • Fibrous - close to the surface collects precipitation, combine efforts with TAP to maximize efficiency, mostly found in monocotyledons • Adventitious - help plants climb; ivies, modified underground stems; bulbs, common in both dicots and monocots

  20. ANY EXAMPLES Tap:Fruit treesFibrous:TrilliumAdventitious:Lily of the Valley

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