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Biology final exam Test

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5 Written Questions

5 Matching Questions

  1. reproduction of mollusks
  2. respiration and circulation
  3. Medusa
  4. four-chambered heart
  5. placentals
  1. a keeps oxygenated blood seperate from deoxygenated blood--> provides good supply of O2
  2. b mammals that carry young inside the uterus until development is almost complete
  3. c -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
  4. d -mammals need a lot of energy for heating, cooling, & locomotion
    -thus, large amounts of O2 are needed
    -Four-chambered heart
  5. e umbrella-shaped body w/ tentacles hanging down

5 Multiple Choice Questions

  1. -the jellyfishes
    -medusa stage is dominant
    -have muscle-like cells in outer cell layer that contract, propelling animal in water
    -occur everywhere, from tropical waters to the Arctic
  2. -mammals that reproduce by laying eggs
    -nurse young after hatching
    -found only in Australia, Tasmania, and New Guinea
  3. tube-shaped body and a mouth surrounded by tentacles.
    -only stage in hydras, corals (always colonial), and anemones (singular)
  4. 2 groups:
    1. Hydroids: hydras which consist of branching polyp colonies formed by budding
    2. Siphonophores: floating colonies on ocean surface
    ex) Portuguese man-of-war
  5. -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 True/False Questions

  1. modified limbs-mammals that reproduce by laying eggs
    -nurse young after hatching
    -found only in Australia, Tasmania, and New Guinea


  2. corals-live in colonies of polyps usually in warm waters
    -secrete calcium carbonate (limestone) around soft bodies for protection-may eventually build coral reefs (hard corals)


  3. respiratory system-most mollusks have gills-rich supply of blood/exchange of gases; land snails and slugs have primitive lungs


  4. diaphragmsheet of muscle seperating expands and contrasts the chest cavity


  5. nervous systemnephridia- organs that remove metabolic wastes


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