Question
Download Solution PDFWhich phylum includes organisms with radial symmetry, such as sea anemones and jellyfish?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Cnidaria.
Key Points
- Cnidaria is a phylum that includes aquatic organisms such as jellyfish, sea anemones, corals, and hydras.
- Organisms in this phylum exhibit radial symmetry, meaning their body parts are arranged around a central axis.
- Cnidarians possess specialized cells called cnidocytes, which contain nematocysts used for capturing prey and defense.
- They have a simple body structure with two main layers: the epidermis and the gastrodermis.
- Their body plan includes a single opening that serves as both the mouth and the anus.
- Cnidarians can exist in two forms: polyp (sessile) and medusa (free-swimming).
Additional Information
- Mollusca
- Mollusca is a phylum that includes snails, clams, squids, and octopuses.
- They typically have a soft body and many possess a hard external shell.
- Mollusks have a muscular foot used for locomotion and a mantle that may secrete a calcium carbonate shell.
- Platyhelminthes
- Platyhelminthes, also known as flatworms, include tapeworms, flukes, and planarians.
- They exhibit bilateral symmetry and have a flattened body structure.
- These organisms lack a body cavity (acoelomate) and have a simple digestive system.
- Porifera
- Porifera, commonly known as sponges, are simple multicellular organisms.
- They have porous bodies and rely on filter feeding to obtain nutrients.
- Sponges lack true tissues and organs and have a skeleton made of spicules or spongin fibers.
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