Lesson 5.4 Moss and LiverwortsCharacteristics of moss:Nonvascular therefore have no trueroots, leaves or stemsCalled bryophytesGrow in shade and moistenvironmentsGrow low to ground as ground coverHave 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 weatheringPrevent 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 generationProduced 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 generationProduces egg and sperm cellsSperm cells must swim to eggcellResults in fertilization andformation of sporophytes plant
Lesson 5.4 Moss and Liverworts LiverwortsCharacteristics:BryophytesNo true leaves, stems or rootsHave rhizoidsGrow in moister places thanmossReproductive structures look likeumbrellas
Lesson 5.5 Algae CharacteristicsBelong to kingdom ProtistaMost contain chlorophyllMost small in sizeLack stem, roots, or leavesMost live in waterImportant the food chain becausecompose most of plankton
Lesson 5.5 Algae CharacteristicsImportant 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
Lesson 5.5 AlgaeClassified 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
Lesson 5.5 AlgaeClassified 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
Lesson 5.5 AlgaeClassified 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