Biology Notes II 2/9
Biology Notes II 2/9 BIO 1144
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This 4 page Study Guide was uploaded by Rocket on Tuesday February 9, 2016. The Study Guide belongs to BIO 1144 at Mississippi State University taught by Thomas Holder in Spring 2016. Since its upload, it has received 71 views.
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Date Created: 02/09/16
HormonesCont 3 Gibberellins Gibberellic Acids Growth promoting Found throughout plant but highly concentrated within seeds Effects Promote stem elongation Promote cell division Promote the breakdown of food preserves in germinating seeds Corn seed Aleurone Layer outer layer stored food Embryo Stored food mostly starch LN a L39 SirJ 3171 2 2 3 Food Breakdown 1 Intake of water causes swellingcracking of seed coat Embryo secretes Gibberellins Gibberellins transported to Aleurone Layer Aleurone layer secretes enzyme oxamylase which breaks the bonds of starch molecules 9599 Starch gt Glucose gt Cell respiration gt yields ATP for growth gt quot Embryo directs process takes cues from water intake Advantage of seed plants able to regulate water intake and determine when to sprout or stay dormant 4 Abscisic Acid Growth Inhibitor Found in mature leaves dormant buds and seeds Effects Inhibits cell elongation Inhibits aamylase secretion by Aleuron layer Promotes production of storage compounds in seeds to prevent early germination Promotes leaf senescence 5 Ethylene Growth Inhibitor Not really hormone not transported within plant Gas released from plant Effects Interacts with the 3 growth promoting hormones to regulate cell size and shape If cells grow too fast then the cell wall isn39t strong enough to support Promotes abscission of leaves fruits and owers Promotes fruit ripening El Growth from Seed Requires Aha Putnam Breaking of Dormancy quotquotJ a nxstzissinn lager Combinations of IntemalExtemal Factors Internal External Hormones Sunlight Stored food Temp Absorption water Day lengths Embryo swelling Soil moisture gt Seed contains Seed coats embryo stored food As seed coats crack Radicle 1st root gt grows down Shoot stem leaves gt grows up Cotyledons emerge embryonic leaves 1 Cotyledon monocot me quot 39mh Ewequotem 2 Cotyledons dicot gt Seedling plant Results of mitosiscytokinesis cell reprod Increase in cell size Intemal Development Plant Cells gt Plant Tissues gt Plant Organs Tissue aggregation of functionally similar cells Organ Root stem leaf Organism Plant 39339 Plant Nutrition Essential Elements nutrients 16 in total C H 0 gt from C02 H20 13 Soil Nutrients minerals Absorbed dissolved in H20 through roots follow pathway With H20 Macronutrients 6 require more than 1 gram Micronutrients 7 trace elements less than 01 gram Nitrogen N Component of proteins nucleic acids coenzymes chlorophyll Potassium K Enzyme activator openclosing of leaf stoma ionic balance of cells Phosphorus P nucleic acids ATP coenzymes phospholipids Calcium Ca cell walls regulator of membrane and enzyme activities membrane permeability rth39rienf Sulfur S proteins coenzymes Magnesium Mg enzyme activator chlorophyll Molybdenum Mb nitrogen fixationabsorption Copper Cu activator component of many enzymesespecially basic function Zinc Zn activatorcomponent of many enzymes Manganese Mn enzyme activator chloroplasts membranes oxygen release from chloroplasts Chlorine Cl ion balance oxygen production during photosynthesis Boron B membrane structure nucleic acid synthesis Iron Fe chlorophyll production Plant Transport Ch 38 Water Soil Nutrients Xylem Movement of Water and Solutes in plants Food Carbohydrates Hormones Phloem Importance of Water Photosynthesis Support for plant organs Conduction Cell elongation Nearly all chemical reactions Avg plant cell gt 90 water Solvent for most substances Solution mixture of 2 compounds Solvent compound in solution usually in greater quantity usually liquid Solute compound in solution in lesser quantity usually dissolved CI Physical Properties of Water Polar molecule overall charge neutral r PK Hydrogen bonding each water molecule is Hydrogen bonded to 4 others tight net 0 U gt Cohesiveness water molecules stick together tight gt Adhesiveness sticks to other polar compounds cellulose gt Temp Stabilizer water can heatcool things gt Transport medium water ows in response to pressure concentration gt BEST biological solvent best liquid to dissolve solutes 3 forms Within Earth39s temperature range solid liquid gas
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