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BSC 116 Week 3 Notes- Lectures 9&10

by: Alexia Acebo

BSC 116 Week 3 Notes- Lectures 9&10 BSC 116

Marketplace > University of Alabama - Tuscaloosa > Biology > BSC 116 > BSC 116 Week 3 Notes Lectures 9 10
Alexia Acebo
GPA 3.7
Principles Biology II
Jennifer G. Howeth

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About this Document

A collection of the third week of notes from BSC 116 covering material from lectures 9 & 10.
Principles Biology II
Jennifer G. Howeth
Class Notes
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This 3 page Class Notes was uploaded by Alexia Acebo on Sunday September 13, 2015. The Class Notes belongs to BSC 116 at University of Alabama - Tuscaloosa taught by Jennifer G. Howeth in Summer 2015. Since its upload, it has received 102 views. For similar materials see Principles Biology II in Biology at University of Alabama - Tuscaloosa.


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Date Created: 09/13/15
angiosperms have seeds owers and fruit owers sexorgans made up of up to 4 rings of specialized leaves sporophylls 1 sepals outermost ring usually green 2 petals bright colors l attract pollinators 3 stamens male owerparts a anthers on laments produce pollen 4 carpels female owerparts a produce female gametophytes b seed container c stgma stickypollen binds to styletube ovary connected to tube fruits mature ovary Va riation in Flowers 1 Symmetry 2 Complete Vs Incomplete Flowers Angiosperm Life Cycle can be highly specialized female gametophyte has large central cell with 2 nuclei nn 0 male gametophyte pollen has 2 haploid n cells 1 generative cell divides to form 2 sperm 2 tube cell produces pollen tube 0 Pollen adheres o Pollen then releases 2 sperm through the tube 0 1 fertilizes the embryo 2n 0 1 fuses w 2 nuclei in central cell endosperm 3n 1 sperm w 1 egg diploid zygote 1 sperm w central cell triploid endosperm ldouble fertilizationprocess unique to angiosperm egg and sperm usually from different plantscross pollination Animals are Dependant on Plants and Vice Versa Herbivory animals feeding on plants plants have various adaptations to keep from being eaten Defenses chemical caffeine nicotine morphine physical mechanicalthorns silica crystal many fruits are adapted for animal transport plantpollinator relationships may be highly specialized coevoution of insects and owering plants Pant Uses food 80 of our calories come from only 6 angiosperm crops wheat rice maize cassava and sweet potatoes food for other human food plants to feed ivestockcorn shelter fuel wood bers clothing moss for peat medicines 25 of prescription drugs contain active ingredients from seed plants spices from many plant parts ecosystem function nutrient cycling 3 Levels of Plant Organization multicellular organisms are more than just a cluster of cells various types of cells differentiated to perform speci c functions 0 cells for photosynthesis support absorption transport tissues cells w similar function 0 dermalexternal vascular transport groundother organs 2 main systems 0 L Rootroots o L Shoot stems leaves Root Functions anchor absorb minerals and water store carbohydrates 2 main morpholooies 1 2 taproot main vertical from primary root many lateral roots tall plants fibrous roots no main root lots of little branches small plants have root hairs increase surface area for absorption extensions of root dermal cells adventitious roots root tissue emanating from stems leaves Shoot system reproduction and photosynthesis 1 2 3 1 Stems Leaves Flowers Stems grow to increase above ground volume occupied by branching and facilitates dispersal of pollen and fruits a Alternating nodes where leaves attach and internodes stem segments between nodes b Primary growth via apical bud w branches formed by axillary buds c Apical dominance axillary bud growth 2 Leaves main organ of photosynthesis a Composed of blade and petiole stalk b Veins vascular tissue of leaves c Simple vs compound leaves d Conifer needles are leaves e Leaves can be modi ed for function 3 Flowers part of shoot system but purpose is reproduction Plants are made up of 3 tissue systems 1 Dermal 2 Ground 3 Vascular xylem and phloem together stele Plant growth is different than animal growth Vertebrate growth usually determinate limited to embryonicjuvenile Plant growth generally indeterminate made up of embryonic juvenile and adult organs 2 types of meristems allow plants to both lengthen and increase the diameter of roots and shoots Apical meristems responsible for primary growth most growth herbaceous plants Lateral Meristems secondary growth girth woody plants vascular cambium xylem phloem cork cambium replaces derm Apical Meristem located behind root cap Protects root tip against soil Secretes polysaccharide lubricant o 3 overlapping zones of development dermal tissue upper and lower epidermis stomata openings in epidermis that allow air to reach photosynthetic ground tissue Guard cells regulate openclose Ground tissue mesophyll photosynthetic cells space between mesophyll cells allows diffusion of gases


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