Biol 11 Lesson 1 April 5  - Arthropoda (1)
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Biol 11 Lesson 1 April 5 - Arthropoda (1)

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Biol 11 Lesson 1 April 5  - Arthropoda (1) Biol 11 Lesson 1 April 5 - Arthropoda (1) Presentation Transcript

  • Phylum Arthropoda: Arthropods Chapter 28: Arthropods pp. 606-631
    • Biology fun facts of the day:
    No two human beings have the same fingerprint; likewise, no two spider webs are the same.
    • Mosquitoes dislike citronella because it irritates their feet. You're more likely to be a target for mosquitoes if you consume bananas.
    Biology fun facts of the day: View slide
    • Each year, insects eat 1/3 of the Earth's food crop.
    Biology fun facts of the day: View slide
    • Australian termites have been known to build mounds twenty feet high and at least 100 feet wide.
    Biology fun facts of the day:
  • Introduction to Arthropods
    • Phylum Arthropoda - Latin arthro = “joint”, pod = “foot”
    • Bilateral symmetry
    • 3 cell layers (ectoderm, endoderm, mesoderm)
    • Have a coelom (reduced to the excretory and reproductive systems)
    • Key features:
    • Jointed appendages
    • Exoskeleton (made of chitin)
    • Segmented body (head, thorax, abdomen segments)
      • Probably evolved from segmented wormlike animals, similar to
      • modern annelids
  • Subphyla of Arthropods
      • Subphylum Trilobita: ex: trilobites
      • Oldest subphylum, all extinct now, but ubiquitous for many era.
      • Subphylum Chelicerata: ex: spiders, scorpions, ticks, mites, horseshoe crabs, etc.
        • Special mouthparts called chelicerae
      • Subphylum Crustacea: ex: crabs, lobsters, shrimp, etc.
      • Over 35,000 species!
      • Subphylum Uniramia: ex: millipedes, centipedes, and all insects
      • Huge group!
  • Form and Function of Arthropods
        • Arthropods vary a lot , but share some key features:
        • Jointed appendages
        • Exoskeleton
        • Segmented body
        • Brain located in the dorsal part of the head
        • Ventral nerve cord
        • Open circulatory system powered by a single heart
    *3 most important features* Grasshopper diagram
  • Form and Function of Arthropods
        • Digestive system:
        • Complete digestive tract (mouth  anus)
        • Many arthropods have specialized feeding parts
        • Every mode of feeding is seen
        • Examples:
        • Predators
        • Filter feeders
        • Parasites
        • Scavengers (detritivores)
        • Herbivores
        • etc.
        • Respiratory system:
        • 1) Gills – feathery structures (ex: crustaceans)
          • 2) Book gills/lungs – pagelike sheets of respiratory tissue
          • (ex: chelicerates)
          • 3) Tracheae – network of tubes that carry air (ex: uniramians)
        • Circulatory system:
        • Open circulatory system
        • Well-developed heart pumps blood through arteries, which branch into smaller vessels which lead to open spaces called sinuses
        • Excretory system:
        • Malpighian tubules (terrestrial arthropods)
        • Gills or green gland (aquatic arthropods)
        • Nervous system:
        • All arthropods have a brain that consists of a pair of ganglia
        • Ventral nerve cord
        • Ganglia along nerve cord
        • Many sense organs may
        • be present
        • Examples:
        • Eyes (compound or simple)
        • Antennae
        • Statocysts
        • Tympanic membrane
        • Chemoreceptors
        • Musculoskeletal system:
        • Movement only at joints
        • Muscles attached to inside of exoskeleton
        • Arthropods moult when they grow because exoskeleton won’t expand
    Freshly moulted crab Crab moult Cicada moult
  • Babies look like miniature adults . They increase in size as they grow older, but do not change overall form . Ex: grasshopper Eggs hatch into larvae (immature stages that do not look like adults). As larvae grow, they change shape dramatically. Ex: butterfly, bees, wasps
  • Ecology of Arthropods
    • Arthropods are the bottom of the food chain (ex: copepods)
    • Pollination – co-evolution with flowering plants
    • Symbiotic relationships (ex: cleaner shrimp and fish)
    • Food source for humans (especially crustaceans)
    • Useful chemicals
    • Honey, silk
    • Disease carriers (ex: mosquitoes, mites, ticks)
    • Crop destruction, pesticides
  • Video – “Arthropods”
  • Homework for next class:
    • Complete Phylum Arthropoda worksheet
    • Read over class notes and check out the class blog: http://msoonscience.blogspot.com/
  • Works Cited
    • Images taken from the following sources:
    • http://www.news.cornell.edu/releases/Oct04/insects.openhouse.ssl.html
    • http://www.cracked.com/funny-1934-spiders/
    • http://www.police.oakland.edu/fingerprints
    • http://www.kiwicare.co.nz/index.cfm/1,182,0,0,html/No-Mosquitoes-Citronella-Candle
    • http://www.dealspice.com/
    • http://www.gardenguides.com/789-corn-rootworm-information.html
    • http://www.ent.uga.edu/veg/colecrops.htm
    • http://www.the-discount-travel-guide.com/Kakadu-National-Park.html
    • http://www.bio.miami.edu/dana/160/160S10_13print.html
    • http://www.thepoisonforest.com/?tag=trilobite
    • http://www.treehugger.com/files/2010/01/deadly-scorpion-venom-used-create-new-safer-pesticide.php
    • http://stirwordfest.wordpress.com/book-lung/
    • http://www.brisbaneinsects.com/brisbane_insects/GrasshopperHead.htm
  • Works Cited
    • http://www.wildsingapore.com/wildfacts/crustacea/moulting.htm
    • http://squirrelbasket.wordpress.com/2010/07/04/words-fledge-fletch-moult-mews-%E2%80%93-and-mould/
    • http://rohlenscience.pbworks.com/w/page/7859192/Insects-Notes
    • http://www.buyinsectcollection.com/identifying_insects
    • http://www.bbcgoodfood.com/content/knowhow/glossary/honey/
    • http://www.livingprairie.ca/livinglandscape/hikes/index.html
    • http://www.superstock.com/stock-photos-images/1532R-3016
    • http://www.raisethehammer.org/article/640
    • http://www.chacha.com/topic/arthropods
    • http://www.nooor.com/search/Invertebrate/&p=13