Test: Cnidaria & Ctenophora - JAMB MCQ

Organisms in Phylum Cnidaria, such as jellyfish and sea anemones, possess specialized cells called cnidocytes that contain stinging structures called nematocysts.

Organisms in Phylum Ctenophora, commonly known as comb jellies, have rows of comb-like cilia that they use for locomotion.

Both Phylum Cnidaria and Phylum Ctenophora possess a nerve net, which is a diffuse network of neurons that coordinates their basic movements and responses.

Sea anemones and corals are examples of organisms belonging to Phylum Cnidaria. Sea stars and sea urchins belong to Phylum Echinodermata.

Phylum Cnidaria lacks a true body cavity and is considered to be diploblastic, meaning they have two tissue layers: the outer ectoderm and inner endoderm.

Organisms in Phylum Ctenophora exhibit biradial symmetry, which means they have radial symmetry combined with bilateral symmetry.

Phylum Platyhelminthes, or flatworms, have remarkable regenerative abilities and can regenerate lost body parts, such as their heads or tails.

Phylum Cnidaria possesses a gastrovascular cavity, a central digestive cavity with a single opening that functions in digestion and distribution of nutrients.

Organisms in Phylum Ctenophora are known for their ability to produce bioluminescence, a phenomenon where they emit light.

Phylum Cnidaria has a larger number of species compared to Phylum Ctenophora. It includes diverse organisms such as jellyfish, sea anemones, and corals.