Which of the following phyla is characterized by the absence of a coelom?
Platyhelminthes are acoelomates, meaning they lack a body cavity between the body wall and the gut.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Arthropoda
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Which of the following phyla is characterized by the presence of cnidoblasts?
Cnidarians possess cnidoblasts, which contain nematocysts used for capturing prey and defense.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Lophophorates include which of the following phyla?
Lophophorates sensu lato group coelomate protostomes possessing lophophore as filter organ and U-shaped tract where mouth and anus open outside lophophore circle except entoprocts. Core assemblage includes three recognized phyla: Phoronida solitary horseshoe worms in chitinous tubes, Brachiopoda lamp shells with biconvex dorsal-ventral bivalved shell, and Bryozoa also called Ectoprocta colonial moss animals forming encrustations. Former inclusion of Entoprocta now excluded rendering concept polyphyletic, though pedagogically useful. Molecular phylogenomics places lophophorates within Lophotrochozoa, with brachiopod-phoronid clade often labeled Brachiozoa, sharing ciliated feeding strategy as possibly homologous feature among suspension feeders.
Ref: Campbell Biology, 12th ed., Chapter 33: Lophophorates Phoronida Brachiopoda Bryozoa; NCBI