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Biology Lessons 5.4 and 5.5
 

Biology Lessons 5.4 and 5.5

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    Biology Lessons 5.4 and 5.5 Biology Lessons 5.4 and 5.5 Presentation Transcript

    • Lesson 5.4Moss and Liverworts
    • Lesson 5.4 Moss and LiverwortsCharacteristics of moss:Nonvascular therefore have no trueroots, leaves or stemsCalled bryophytesGrow in shade and moistenvironmentsGrow low to ground as ground coverHave rhizoids that anchor the plant
    • Lesson 5.4 Moss and LiverwortsCharacteristics of moss:Rhizoid - thread-like hairs that growdown into soilBenefits of moss:Replenish soil by chemical weatheringPrevent soil erosion
    • Lesson 5.4 Moss and LiverwortsEconomic importance:Sphagnum – grows in swamps, cellshold water.Peat Moss/Peat - decaying plantmaterial trapped in bottom of aswamp and in US is sold to mix withsoil to increase moisture retentionand enrich the soil.
    • Lesson 5.4 Moss and LiverwortsSpanish moss is called a mossbut is really an angiosperm.
    • Lesson 5.4 Moss and Liverworts Life Cycle of MossHas alternating generations:A. Sporophyte generationProduced on top of female plantand produces spores afterfertilization Spores are released andbecome gametophyte plants
    • Lesson 5.4 Moss and Liverworts Life Cycle of MossHas alternating generations:A. Sporophyte generationB. Gametophyte generationProduces egg and sperm cellsSperm cells must swim to eggcellResults in fertilization andformation of sporophytes plant
    • Lesson 5.4 Moss and Liverworts LiverwortsCharacteristics:BryophytesNo true leaves, stems or rootsHave rhizoidsGrow in moister places thanmossReproductive structures look likeumbrellas
    • Lesson 5.5 Algae
    • Lesson 5.5 Algae CharacteristicsBelong to kingdom ProtistaMost contain chlorophyllMost small in sizeLack stem, roots, or leavesMost live in waterImportant the food chain becausecompose most of plankton
    • Lesson 5.5 Algae CharacteristicsImportant the food chain because compose most of planktonPlankton - the collection of small ormicroscopic organisms that float or driftin great numbers in fresh or saltwater, especially at or near thesurface, and serve as food for fish andother larger organisms.Classified by color
    • Lesson 5.5 Algae Classification A. Green Algae o Largest group o Green o Mostly microscopic, single celled o Some live in colonies o Some filamentous, have filaments to attach to rocks o freshwater
    • Green Algae
    • Lesson 5.5 AlgaeClassified by colorB. Yellow algae oContains yellow pigment oPhotosynthetic – chlorophyll too oIncludes diatoms (two part silica shell) oCollection of empty shells makes diatomaceous earth used in toothpaste, scrubbing products, filters & dynamite to stabilize
    • Diatoms
    • Lesson 5.5 AlgaeClassified by colorC. Brown algae obrown pigment oPhotosynthetic – chlorophyll too oMostly seaweed including the giant kelps that live in the ocean oAlgin from kelp used in food products to hold liquids together like in mayonnaise
    • Brown algae – Giant Kelp
    • Lesson 5.5 AlgaeClassified by colorD. Red algae oFound in great depths in the ocean oCan trap wavelengths of light that travel deep into water and use for photosynthesis oContain carrageenin used to thicken products like ice cream and nutrient agar
    • Lesson 5.5Other Algae:A. Dinoflagellates•Microscopic algae•Have two flagella•Cause red tides which is whenextreme growth or blooms creating atoxin that can kill fish
    • Lesson 5.5 AlgaeB. Cyanobacteria or blue-green algae•Originally classified as algae now asbacteria•Many have a bluish appearance•Great survival in adverse conditions