Question

Short note on phylum ctenophora

Answer 1

Hi.  here is your answer.   Ctenophora , commonly known as sea walnut or comb jellies are exclusively marine, radially symmetrical, diploblastic organism with tissue level of organisations.   The body bears eight external rows of cilliated comb plates, which is both extra cellular and intracellular.   Bioluminescence is well marked in ctenophora.   sexes are not separate. Reproduction takes place only by sexual means. Fertilisation is external with indirect development

Answer 2

All ctenophores are exclusively marine.They are diploblastic having ectoderm and endoderm.Tissue level of organization is present. Tentacles may or may not be present. When present, they are two in number.Comb like eight ciliary plates called comb plates are present on the body. The cilia of these plates help in swimming. Ctenophores are hence called comb Jellies.They are acoelomates.Circulatory, respiratory and excretory systems are absent.Fertilization is generally external. Asexual reproduction is not present. Paedogenesis is common.The development is indirect with a ciliated sphencal cydippid larva.