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Flatworm: Quiz


Question 1: The eggs of trematodes are excreted from their main hosts, whereas adult cestodes generate vast numbers of ________, segment-like proglottids which detach when mature, are excreted and then release eggs.
HermaphroditeIntersexualitySpeciesSexual differentiation

Question 2: Most turbellarians have pigment-cup ________ ("little eyes"), one pair in most species but two or even three pairs in some.
StrepsipteraAntSimple eyes in arthropodsArthropod

Question 3: In North-west Europe there are concerns about the spread of the New Zealand planarian Arthurdendyus triangulatus, which preys on ________.

Question 4: Cestodes (tapeworms) and trematodes (flukes) have complex life-cycles, with mature stages that live as parasites in the digestive systems of fish or land ________, and intermediate stages that infest secondary hosts.

Question 5: [9] In most species "miniature adults" emerge when the eggs hatch, but a few large species produce ________-like larvae.
PlanktonPhytoplanktonPrimary productionZooplankton

Question 6: [2] They infest the guts of bony or cartilaginous fish and of turtles, and the body cavities of marine and freshwater ________ and gastropods.

Question 7: [5] Hence the traditional sub-phylum "________" is paraphyletic, since it does not include the Neodermata although these are descendants of a sub-group of "turbellarians".

Question 8: Cestodes have no mouths or guts, and the syncitial skin absorbs nutrients – mainly carbohydrates and ________ – from the host, and also disguises it chemically to avoid attacks by the host's immune system.
Amino acid synthesisAmino acidL-DOPAMetabolism

Question 9: In traditional zoology texts Platyhelminthes are divided into Turbellaria, which are mostly non-parasitic animals such as planarians, and three entirely parasitic groups: Cestoda, ________ and Monogenea.
Schistosoma mansoniNematodeFlatwormTrematoda

Question 10: What does the following picture show?

  Two turbellarians mating by penis fencing. Each has two penises, the white spikes on the undersides of their heads.
  Lifecycle of the eucestode Taenia. Inset 5 shows the scolex, which has 4 suckers round the sides and, in Taenia solium, a disk with hooks on the end. Inset 6 shows the tapeworm's whole body, in which the scolex is the tiny round tip in the top left corner, and a mature proglottid has just detached.
  Magnetic resonance image of a patient with neurocysticercosis demonstrating multiple cysticerci within the brain

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