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Comparative Features of Animal Phyla
Concepts tested here
- Morphological features of invertebrates
All Questions
2008 AIPMT 1 question
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Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature?
(Each option gives three animals followed by the morphological feature.)Scorpion, spider and cockroach are all arthropods. Like all non-chordates, they have a ventral, solid and double nerve cord (central nervous system). So this group is correctly matched.
Cockroach and locust show metameric segmentation, but Taenia (tapeworm) does not; its body is divided into proglottids, which is pseudo-segmentation.
Liver fluke is bilaterally symmetrical, but the sea anemone (a cnidarian) is radially symmetrical and the adult sea cucumber (an echinoderm) basically has radial symmetry.
Centipede and prawn are arthropods with jointed appendages, but the sea urchin is an echinoderm; it has tube feet, not jointed appendages.
So the correctly matched group is scorpion, spider, cockroach - ventral solid central nervous system.