HORT 100 Week 2 Notes
HORT 100 Week 2 Notes HORT 100-001
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This 6 page Class Notes was uploaded by Erin Wade on Friday September 2, 2016. The Class Notes belongs to HORT 100-001 at Colorado State University taught by Hughes, Harrison G in Fall 2016. Since its upload, it has received 37 views. For similar materials see Horticultural Science in Agriculture / Horticulture at Colorado State University.
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Date Created: 09/02/16
8/29/16 Cellular Structure The cell is the basic structure of the organism Cytology the study of cells Types ● Prokaryote No separate subcellular units ● Eukaryote Compartmentalization bounded by membranes Cytoplasm liquid that all the stuff is floating around in Plant Tissue Meristematic Cells are capable of cell division ● Apical Meristems ○ Shoot ○ Root ○ Ex: grass keeps growing even though we cut off the tops ● Subapical Meristems ● Intercalary Meristems ● Lateral Meristems ○ Vascular Cambium ○ Cork Cambium Permanent Mature cells are incapable of cell division ● Simple tissue composed of single type of cells ○ Parenchyma ○ Collenchyma (the strings in celery) ○ Sclerenchyma (rough cells just under the skin of pears) ● Complex tissue composed of more than one type of cells ○ Xylem ■ Xylem vessels ■ Tracheids individual cells that elongate and taper ○ Phloem ■ Sieve tubes ■ Companion cells Meristematic Tissue actively dividing cells ● Permanent Tissues Simple ● Epidermal ○ Out cell wall is thicker to hold on to water ● Parenchyma ● Sclerenchyma ○ Dead cells, highthy thickened walls ● Collenchyma ● Cork 8/31/16 Plant Organs Leaves ● Leaf blade (flat part involved in photosynthesis) ○ Margin ○ Tip ● Petiole (stem) ● Stipule (leafy/grassy things on stem) ● Stomates minute opening in the epidermis through which gas exchange occurs, location varies from plant to plant 9/2/16 Root Morphology Fibrous Root System Ex: grass Tap Root System Ex: carrot Regions of Root: ● Area of cell maturation ● Area of cell elongation sprout root hair to increase surface area of roots to absorb more water ○ If you root something in water, they do not sprout root hairs ● Apical Meristem ● Root Cap Young Root More Mature Root Flowers Specialized floral leaves modified for sexual reproduction (both male and female) Used extensively in the identification of plant species relative to the position of the ovary and how the floral parts are held A flower is complete if all four kinds of floral organs are present (sepals, petals, stamens, pistil) Complete Flower 1. Sepal Calyx 2. Petal Corolla 3. Stamen Filament Anther Sac 4. Pistil Stigma Style Ovary Perfect vs. Complete Perfect flowers has stamens and pistils Imperfect flowers if either stamens or pistils are missing ● Staminate If stamens are present and pistils absent ● Pistillate If pistils are present and stamens absent ● Monoecious Both Staminate and Pistillate flowers occur on same plant ○ Ex: corn ● Dioecious Staminate and Pistillate flowers occur on different plants ○ Ex: asparagus A flower can be perfect but still be incomplete if it has everything that is necessary Microspore Pollen ● Generative Nucleus ● Sperm Nuclei ● Pollen Tube Nucleus ● Megaspore Ovule embryo sac ● Megaspore ● Egg Nucleus ● Antipodals ● Synergids ● Polar Nucellus Tissues
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