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Question
A marine organism is identified, which is both radially symmetrical and bioluminescent. To which phylum can it be classified?
A marine organism is identified, which is both radially symmetrical and bioluminescent. To which phylum can it be classified?
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Solution
The correct option is D Ctenophora
Ctenophora, also known as sea walnuts or comb jellies, is exclusively marine and exhibits radial symmetry, i.e., their body is organized about a central axis. Bioluminescence is a well known feature of this phylum, a property in which living organisms emit light from their body. Example: Ctenoplana and Pleurobrachia.
Even though cnidarians (Coelenterata) show radial symmetry, they do not exhibit bioluminescence. They possess cnidoblasts bearing stinging capsules that assist in anchorage, defense, and catching prey.
Annelida shows bilateral symmetry, i.e., their body can be divided equally along a single plane. Example: Pheretima (earthworm).
Porifera or sponges are mostly asymmetrical, i.e., they cannot be divided equally along any plane that passes through the center. Example: Sycon.
Ctenophora, also known as sea walnuts or comb jellies, is exclusively marine and exhibits radial symmetry, i.e., their body is organized about a central axis. Bioluminescence is a well known feature of this phylum, a property in which living organisms emit light from their body. Example: Ctenoplana and Pleurobrachia.
Even though cnidarians (Coelenterata) show radial symmetry, they do not exhibit bioluminescence. They possess cnidoblasts bearing stinging capsules that assist in anchorage, defense, and catching prey.
Annelida shows bilateral symmetry, i.e., their body can be divided equally along a single plane. Example: Pheretima (earthworm).
Porifera or sponges are mostly asymmetrical, i.e., they cannot be divided equally along any plane that passes through the center. Example: Sycon.
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