Which one of the following groups of three animals are correctly matched with their characteristic feature?
Animals Characteristic features
(a) Scorpion, spider, cockroach - Open circulatory system
(b)
Cockroach, locust, Taenia - Metameric segmentation
(c) Planaria, Hydra, earthworm - Triploblastic
(d) Centipede, prawn, sea urchin - Jointed appendages

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Solution

Scorpions, spiders, and cockroaches are invertebrates and belong to the phylum Arthropoda. they have an open circulatory system.
The body of the cockroach and locust is segmented. In Taenia, the body is without true segments.
Hydra is diploblastic.
Centipede and prawn have jointed appendages while sea urchin does not have jointed appendages.
Scorpion, spider, cockroach are matched correctly.

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Similar questions

\begin{matrix} Animals & Morphological feature A. Liver fluke, sea anemone, & Bilateral symmetry sea cucumber B. Centipede, prawn, sea urchin & Jointed appendages C. Scorpion, spider, cockroach & Ventral solid nerve cord D. Cockroach, locust, Taenia & Metameric segmentation \end{matrix}

	Animals	Characteristic feature
(a)	Scorpion, spider, cockroach	Ventral solid central nervous system
(b)	Cockroach, locust, tapeworm	Metameric segmentation
(c)	Liver fluke, sea anemone, sea cucumber	Bilateral symmetry
(d)	Centipede, prawn, sea urchin	Jointed legs

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