In which of the following phyla does the adul | vedclass

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(D) The correct answer is $D$. In the phylum $Echinodermata$,adult animals exhibit radial symmetry,while their larval stages exhibit bilateral symmetr

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Echinodermata

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(D) The correct answer is $D$. In the phylum $Echinodermata$,adult animals exhibit radial symmetry,while their larval stages exhibit bilateral symmetry. This transition in symmetry from bilateral in the larval stage to radial in the adult form is a characteristic feature of echinoderms. In contrast,$Annelids$,$Arthropods$,and $Molluscs$ exhibit bilateral symmetry throughout their life cycles.

Column-$I$	Column-$II$
$(i)$ Asterias	$(a)$ Brittle star
$(ii)$ Echinus	$(b)$ Sea lily
$(iii)$ Antedon	$(c)$ Sea urchin
$(iv)$ Ophiura	$(d)$ Star fish

In which of the following phyla does the adult show radial symmetry,while the larva shows bilateral symmetry?

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Write the general characteristics of the phylum Echinodermata.

Match column-$I$ with column-$II$ :
Column-$I$ Column-$II$
$(i)$ Asterias $(a)$ Brittle star
$(ii)$ Echinus $(b)$ Sea lily
$(iii)$ Antedon $(c)$ Sea urchin
$(iv)$ Ophiura $(d)$ Star fish

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