Digestive organs, circulatory system, and nerve cords are completely absent in E
ID: 252628 • Letter: D
Question
Digestive organs, circulatory system, and nerve cords are completely absent in
Ectoprocta
Platyhelminthes
Porifera
Mollusca
Annelida
Due in great part to its characteristic of having a fixed number of cells in the adult, Caenorhabditis elegans has become an important model research organism in developmental biology. To which phylum does C. elegans belong?
Annelida
Nematoda
Platyhelminthes
Arthropoda
Nemertea
A lophophore is a structure used by lophophorates for
sensory reception
respiration
feeding
locomotion
structural support
sensory reception
respiration
feeding
locomotion
structural support
Explanation / Answer
Digestive organs, circulatory system, and nerve cords are completely absent in
Porifera
Porifera phylum are multicellular organisms which have bodies full of pores and channels that allow water to circulate throughout the body. they do not have specialized organs for digestion, circulation and nervous system. they maintain a constant flow of water allowing food particles to come in and flow out of the body eliminating the wastes.
Due in great part to its characteristic of having a fixed number of cells in the adult, Caenorhabditis elegans has become an important model research organism in developmental biology. To which phylum does C. elegans belong?
Nematoda
C.elegans are free living and transparent nematodes which do not possess respiratory and circulatory systems.
A lophophore is a structure used by lophophorates for
feeding
Lophophores are a ring of ciliated tentacles found surrounding the mouth of aquatic animals. these act as feeding organ for the animals. Lophophores are mainly present in four major groups of animals: the Brachiopoda, Bryozoa, Hyolitha, and Phoronida.
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