write a note on phylum Ctenophora
Answers
Answer:
The phylum Ctenophora, the comb jellies, is a phylum of marine invertebrates. They are part of the plankton, and there are also pelagic species. ... They have eight rows of cilia which look like the teeth of a comb, hence Ctenophore = comb-bearer. Ctenophores have connective tissues and a nervous system.
Phylum: Ctenophora; Eschscholtz, 1829
Kingdom: Animalia.
Answer:
Ctenophores are free-swimming, transparent, jelly-like, soft-bodied, marine animals having biradial symmetry, comb-like ciliary plates for locomotion, the lasso cells but nematocytes are wanting. They are also known as sea walnuts or comb jellies.
Explanation:
Coelenterates are multicellular organisms
They have tissue-grade of organization
The body is radially symmetrical. Radial symmetry is the symmetry of a wheel
All the members of this phylum are aquatic
They are solitary or colonial
Polyps and medusa occur in the life cycle.
The body wall is diploblastic.
Nematocysts or stinging cells are present.
Coelom is absent; hence coelenterates are acoelomate animals
A gastrovascular cavity or coelenteron is present.
Mouth is present; but anus is absent
Digestion is extracellular as well as intracellular
Respiratory, excretory and circulatory system are absent
system is diffuse-type, formed or nerve-nets.
Reproduction is by asexual and sexual methods
Development is indirect as there are one or two larval forms
Life history has alternation of generations or metagenesis.
BRAINLIEST PLS