Presentation on theme: "1. Taproot- one main root that grows straight down."— Presentation transcript:
1 1. Taproot- one main root that grows straight down. Enterprise: Plant ScienceUnit: Basics of Plant ScienceFactor: Information NeededI. Struct-uresRoot systems1. Taproot- one main root that grows straight down.a. used for food (carrots,etc)b. drought tolerant2. Fibrous root- many small roots.a. tie up soil (many grasses)b. not as drought tolerant3. Adventitious roots- specialized roots that develop .
2 B. Stems- there are many types. 1. Woody- tough and winter hardy2. Herbaceous- green and die back.3. Modified stems (specialized)a. bulbs- onions, Easter liliesb. corms- thickened stemsc. rhizomes- horizontal underground stemd. tuber- potatoe. stolon- (runner) above ground horizontal stem (strawberry)C. External stem parts:
3 Stem Part ID Terminal Bud (false) Terminal Bud (true) Auxiliary bud Node &InternodeBud scalesBundle Scar(Small dots)Leaf scarLenticels
4 D. Internal stem & root structures: 1. Xylem- carry water & minerals up.2. Phloem- carry food and nutrients down.3. Structures differ for subclasses:a. monocotyledon- xylem and phloem are in separate rings.(grasses)b. dicotyledon- xylem and phloem in vascular bundles.(broad leaved plants)
5 E. Leaves- manufacture food through photosynthesis 1. Leaf shapes, margins, tips, and bases are important for identification purposes.2. Leaf arrangements are also important identifiers:a. Simple- alternate, opposite, whorled.b. Compound- palmate, pinnate, Bipinnate.3. The simple leaf parts include:
6 Leaf parts Tips Sinus Incised Leaf parts Lobe Midrib Margin Petiole BaseRaised glandStipule
7 F. The flower is the sexual part of the plant. 1. The male part is the stamen.2. The female part is the pistil.a. perfect flowers contain both male and female parts.b. an imperfect flower has only male or female parts, not both.3. Flowers become fruits, nuts, or seeds.
9 II. Physi-ologyPhysiology is the study of function.1. Understanding plant function will allow success in growing them.B. Photosynthesis:1. Is the process in which light energy is converted into stored chemical energy (sugar).2. Carbon dioxide + water in the presence of chlorophyll and light form sugar, oxygen, and watera. chlorophyll is the green pigment in plants
10 C. Respiration is the process of breaking down sugar into heat energy. 1. Sugar and oxygen are used by the plant to produce energy. Carbon dioxide and water are by-products.D. Transpiration is the process of losing water vapor through stoma1. Plants wilt if too much water is transpired.E. Osmosis is used by the plant to bring in water and nutrients
11 Plants require certain chemicals and soil pH to grow successfully. III. Plant NutritionPlants require certain chemicals and soil pH to grow successfully.B. There are 16 nutrients needed for plant growth.1. “C. Hopkin’s café, mighty good.”stands for: carbon, hydrogen, oxygen, phosporus, potassium, nitrogen, sulfer, calcium, iron, and magnesium. The others are boron, copper, chlorine, manganese, molybdenum and zinc.
12 2. The three that are fertilized for the most often are Nitrogen (N), Phosphorus (P), and Potassium (K).a. A fertilizer would have 15% N, 24% P, and 50%K.C. pH is the measure of acidity or alkalinity of the soil.1. pH of 7 is neutral2. Below 7 is acidic, lime is added to raise it towards 7.3. Above 7 is alkaline, sulfur is added to lower it closer to 7.4. Most plants like a pH of 6 to 7.
13 IV. PlantReproReproducing plants is often referred to as propagation. There are two basic types:Sexual propagation- seedsa. germination-Asexual propagationAsexual propagation methods include1. Stem cuttings- uses pieces of the stem
14 2. Leaf cutting- works on many indoor houseplants 3. Root cuttings are used on older plants with large root systems in the dormant season4. Layering- is the process of using a stem while it is still attached to the plant.
15 5. Division- is the process of cutting the main plant into several pieces 6. Grafting- a piece of one plant is attached to another plant.7. Tissue culture- done with small pieces in a laboratory setting.