NEET 2008 Biology question

Which one of the following groups of three animals each is correctly matched with their one characteristic morphological feature? Animals — Morphological feature

(1)Cockroach, Locust, Taenia - Metameric segmentation
(2)Liver fluke, Sea anemone, Sea cucumber - Bilateral symmetry
(3)Centipede, Prawn, Sea urchin - Jointed appendages
(4)Scorpion, Spider, Cockroach - Ventral solid central nervous systemCorrect

Answer: (4)

Solution

All arthropods (scorpion, spider, cockroach) have a solid, ganglionated, ventral nerve cord (a non-chordate feature, in contrast to the dorsal hollow nerve cord of chordates). Hence option (4). (1) Taenia shows only external strobilation,

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Question ID VK-090039