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Chapter 28

Chapter 28 Textbook Notes.docx

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Department
Biology
Course
BI111
Professor
Tristan Long
Semester
Winter

Description
Chapter28TextbookNotes04202012DefinitionsPhotoautotrophsselffeedersuse sunlight carbdon dioxide and water Organ body structures that contain two or more types of tissue and have a definite form and functionTissueA group of cells and intercellular substances that function together in one or more specialized tasksTotipotencyThe ability for a plant cell to give rise to all other parts of a plantAllows plants to health wounds and perform asexual reproductionIndeterminate growthThe ability for plant cells to continue to grow throughout their lifespan do not have a set sizeMeristemsSelfperpetuating embryonic tissue that produces new tissues more or less continuously while the plant is aliveVascular cambium281The plant bodyAlmost all plants are photosynthetic autotrophs with a shoot system that exists above ground containing photosynthetic leaves and stems and a root system below ground made up of nonphotosynthetic rootsThe shoot systemComprised of leaves stems buds and flowers the shoot system is highly adaptive for photosynthesis and the positioning of reproductive shoots which are flowers for pollination which can often develop later into fruits containing seeds The shoot system is comprised of two types of shoots the previously mentioned reproductive shoots and the vegetativenonreproductive shoots which are stems with attached leaves and buds that give rise to extensions of shoots or new branching shootsWhy a large surface is important to resource collection in plants and how selection on resource acquisition has shaped plant morphologyA large surface area is important both above ground and below ground so plant bodies are not compact but spreading and branched in form dendriticKey features and functions of plant cellsPrimary cell wallSurrounding the plasma membraneSkeleton of the plant which serve as supportMade up of microfibrils of cellulose a polymer of glucose embedded in a matrix of other polysaccharidesThe cellulose and polysaccharides gives the cell wall strength and flexibilityContains various proteins that contribute to strength or act as enzymes that catalyze the formation and modification of the cell wall Vacuolesoccupy most of the volume in a mature plant cell and plays an important role in cell elongation and maintenance of rigid tissuesAct as storage componentsPlasmodesmataconnections between adjacent cells that allow solutes like amnio acids and sugars to move from one cell to the next Secondary Cell WallA second wall formed inside the primary wall which is composed of lignin a complex waterinsoluble polymer which makes cell walls very strong rigid and impermeable to waterLignin is very resistant to decompositionWhy do plants have indeterminate growthIt gives plants a great deal of plasticityflexibility This allows it to move in a light dependent direction
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