Which characteristic is unique to phylum Ctenophora?
Ctenophores, also known as comb jellies, use comb plates for locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
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Which feature is unique to phylum Ctenophora?
Bioluminescence, the ability to emit light, is a characteristic feature of Ctenophores.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which feature is a characteristic of phylum Ctenophora?
Ctenophores, or comb jellies, are characterized by the presence of eight comb plates that aid in locomotion.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Ctenophora and Platyhelminthes
Which feature is characteristic of phylum Ctenophora?
Ctenophores have comb plates, rows of cilia used for locomotion (NCERT, Chapter 4, page 50). Nerve nets are in cnidarians, water canal systems in poriferans, and segmentation in annelids.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Phylum Porifera and Cnidaria
Cnidaria and Ctenophora show which symmetry?
Cnidaria and Ctenophora exhibit predominantly radial symmetry where multiple longitudinal planes through central oral-aboral axis divide body into mirror halves, an adaptation advantageous for sessile polyps or drifting medusae capturing prey arriving from all directions using circumoral tentacles bearing cnidocytes or colloblasts. Some ctenophores show biradial symmetry due to paired tentacles and pharynx. Bilateral symmetry with single sagittal plane characterizes Bilateria enabling directed locomotion and cephalization, while asymmetrical or spherical symmetries seen in irregular sponges or Volvox not applicable to cnidarians.
Ref: Campbell Biology 12th ed. Chapter 33 Cnidaria Symmetry; NCERT Class 11 Chapter 4 Body Symmetry