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Answer
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| Fill in the missing words about cestodes
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A cestode (tapeworm) is a chain (strobila) of progressively maturing reproductive units called proglottids anchored at one end to the intestinal wall by a hold-fast organ called the scolex.
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| What species of Taenia occur in dogs?
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- Taenia ovis
- Taenia hydatigena
- Taenia pisiformis
- Taenia multiceps
- Taenia serialis
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| What are the more obvious morphological features of the scolex of a cyclophyllidean tapeworm?
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- Four suckers
- Rostellum with rows of large hooks
- Unsegmented neck (behind the scolex) which gives rise to new segments
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| Describe the features of a cysticercus
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- Fluid filled bladder, containing a single invaginated head (protoscolex) - seen as a white blob on the wall of the cyst
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| What are oviparous insects?
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- Lay eggs outside of the body which hatch after deposition
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| What are viviparous insects?
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- Lay larvae or nymphs
- Eggs rupture in female reproductive system
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| Summarise simple metamorphosis and give an example of a species of insect which uses it
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- Nymph emerges from egg
- Nymph grows and moults
- Nymph becomes an adult
- Lice
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| Summarise complex metamorphosis and give an example of a species of insect which uses it
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- Larva emerges from egg
- Larva grows and moults
- Larva pupates
- Adult emerges from pupa
- Flies
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