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Trees and shrubs 3
Intro to wood technology
| Question | Answer |
|---|---|
| Cellulose (primary component of wood) is a by-product of what? and is a fibrous residue found in what type of cells? | a by product of photo synthesis and a fibrous residue found in woody plant cells |
| Hemicellulose(primary compnet of wood). what is it and how is it produced? | A polymer produced by photosynthesis |
| Ligin(primary componentof wood) acts as a what type of agent between what? | acts as a boning agent between cells |
| Secondary components which are Extractivies can consist of what? | consist of oils and resins |
| Heartwood is composed of what type of cells? what is the main purpose? and it is not used for? | composed of dead cells,not used for conduction and the main purpose is for storage and support |
| Sapwood. What type of cells is it made up of? and what is the purpose of it? | is made up of live cells and is used for conduction |
| Early wood (springwood) is produced when during the growing season. what does early wood look like? | produced early in growing season and it is lighter in colour then latewood |
| Latewood (summerwood) is produced when in the growing season and what does it look like? | Produced later in growing season and is darker in bands |
| Rays are for what type of transport within a stem? what do they look like? | for lateral transport within stem and are going across growth rings |
| Cross section(surface of wood) is what? | cut across the board |
| Radial Face(surface of wood) is a face thats closely parallel to what? | closely parallel to a ray |
| Tangential Faace(surface of wood) is approximately at what angle to a ray? | right angles to a ray |
| Structure of Coniferous Woods-Most cells within this type of wood are what kind of cells? (they allow water to move up) | Most cells are trachieds(allow water to move up) |
| Structure of Coniferous Woods, what can u not see with a hand lens in this type of wood? | cannot see Rays |
| Structure of Coniferous Woods, do not have what? | do not have pores |
| When examining Coniferous woods what do you look for? | presence or absence of resin canals |
| Structure of Decidous woods, also have tracheids (upward conduction of water) and have what other things that are found in the exylem? | has other specialized cell pores (vessels/Trachea) are formed in exylem. |
| Reaction wood is altered as a response to what? | to a lean |
Created by:
cplester
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