Biology 240 Week 6 Notes
Biology 240 Week 6 Notes BIO 240
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This 4 page Class Notes was uploaded by Miriam Valenzuela on Friday March 6, 2015. The Class Notes belongs to BIO 240 at San Francisco State University taught by Dr. Andrew Swei and Dr. Dennis Desjardin in Spring2015. Since its upload, it has received 110 views. For similar materials see Second Semester Biology in Biology at San Francisco State University.
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Date Created: 03/06/15
Biology 240 Notes Week 6 Origin of Land Plants Life Prior to terrestrial Life Snowball Theory Earth was covered by snow climate shocks ignited multicellular life Carbon Dioxide concentration is higher Oxygen concentration is lower Why move onto land Land and Air as new selection pressures no competition for space More light and carbon dioxide for photosynthesis higher levels of minerals Disadvantages Dessication evaporation Mutagenesis UV Radiation Gravity directional growth influence Littoral zone areas of water with fluctuating levels of flooding and drying out inundation and desiccation Algae Plants Contain Chlorophyll a and b store starch cellulose ageHa Chlorophyta microtubules parallel to the new cell wall Closed spindle nuclear membrane doesn t go away Charonhyceans green algae that is the closest related to plants same cell division same photosynthesis system similar proteins flagellated sperm Classification of Plants Kingdom Plantae Kingdom Streptophyta Kingdom Viridiplantae Carophyceans Part II Chlorophyll a and b store starch cell wall made of cellulose open spindle during nuclear division flagellated sperm Adaptation Multicellular Body low surface area volume ratio fewer cells fewer areas exposed to air less water loss Protected Gametangia gamete producing cells surrounded by protective layer of cells inhibits desiccation Oogamous sperm can move egg cannot retained edd and taken care of by parents Zygote remained by parent makes sure that the egg develops because its fed and taken care of by the parent Zygote with protective wall thick wall and dark pigments sporopollenin to help with long term survival All charophyceans undergo zygotic meiosis and all land plants undergo sporic meiosis Embryo newly developed sporophyte kept and fed by parent gametophyte Apical Meristem region of cells that keep on dividing to add length to the plant It s rich in gibberellin which allows the plant to grow Cuticle wax covering of plants waterproof barrier prevent microbial attack Better Protected Gametangia one or more layers of cells surrounding the gamete Land Plants found everywhere Bryophytes Hornworts Mosses Liverworts Asexual reproduction Antheridiophores and archegoniophores Bryobhytes Hornworts tetrads of spores Earliest Vascular Plants Xylem and Phloem Sporophyte dominant functioning stomata Lycophyta Club Mosses two types of sporangia Meiosis Production of scores sporangium homosporous sporangia heterosporous Sporophyte Gametes Gametophyte Zygotes