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5 Written questions

5 Matching questions

  1. Cnidarians
  2. gastropods
  3. phylum mollusca
  4. respiratory system
  5. circulatory system
  1. a -most mollusks have gills-rich supply of blood/exchange of gases; land snails and slugs have primitive lungs
  2. b -stomach-footed
    -most have a single shell (snails, conches, whelks, periwinkles, etc); slugs(protected by mucus) and nudibranchs(bright-colored) do not
    -shelled gastropods nay be herbivores, predators, or parasites
    -nudibranchs that feed on jellyfish incorporate the poisonous nematocysts into their own tissues
  3. c ->9000 species of jellyfishes, corals, sea anemones, and hydras
    -radial symmetry (mammals, reptiles are not symmetry)
    -body is composed of 2 cell layers and one opening (mouth)
    -Great Barrier Reef in Australia is the largest structure ever built by living organisms
    -Body forms: Polyp, Medusa
    -probably evolved from protists about 630 mya
  4. d -most species are ocean dwellers; some lie in freshwater or moist terrestrial environments
    -some attach themselves to the ocean floor, others are free swimming
  5. e -two or three-chambered heart
    -most have an open circulatory system(blood flows in open space); some, such as the octopus have a closed circulatory system(blood flows only in vessels)

5 Multiple choice questions

  1. -has a rubbery snout, webbed front feet, sharp claws for digging & burrowing in soil
  2. -a thin membrane surrounding the internal organs that secretes the shell
  3. -able to maintain a constant body temp independent of their environment
    -temperature regulation:
    1.hair (fur)-evolved from scales and is made of keratin; provides insulation and waterproofing
    2.panting- increases respiratory heat loss& cools of anminal
    3. sweat glands- a form of evaporative cooling
  4. -most mollusks have seperate sexes and reproduce sexually
    -fertilization is usually external
    -many land gastropods are hermaphroditic with internal fertilization
    -on evolutionary adaptation that increases likelihood of fertilization
    -larval stages of all mollusks are similar
  5. umbrella-shaped body w/ tentacles hanging down
    -mobile

5 True/False questions

  1. uterushollow muscular-organ in which offspring develop
    -survival advantage

          

  2. food acquistion of mollusks-may be predators, grazers, or filter feeders
    -radula
    -bivalves, such as clams, do not have radulas; they are filter feeders

          

  3. gestation-the time during which placental mammals develop inside uterus
    - mice 21 days, rhino 19 months, human 38 weeks

          

  4. placentals-organ that provides food and O2 to and removes waste from developing fetus
    -disadvantage: fiddle alcohol syndrome
    *use of alcohol when pregnant can lead to permanent mental/physical problems

          

  5. asexual reproduction-may occur in either polyp or medusa stage
    -polyps reproduce asexually in a process known as budding