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Question
Ambulacral grooves are absent in the living forms of the class
Ambulacral grooves are absent in the living forms of the class
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Solution
The correct option is B Ophiuroidea
Ambulacral grooves extend from the mouth to the end of each ray or arm. Each groove of each arm, in turn, has four rows of hollow tube feet that can be extended or withdrawn.
The ambulacral groove is present in the phylum Echinodermata or class Asteroidea, Edrioasteroidea and Crinoidea.
Therefore, the correct answer is option B.
Ambulacral grooves extend from the mouth to the end of each ray or arm. Each groove of each arm, in turn, has four rows of hollow tube feet that can be extended or withdrawn.
The ambulacral groove is present in the phylum Echinodermata or class Asteroidea, Edrioasteroidea and Crinoidea.
Therefore, the correct answer is option B.
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