Question

Cnidocytes are found in _____.

phylum Porifera
phylum Nemertea
phylum Nematoda
phylum Cnidaria

Answer 1

Cnidocytes, which are found in phylum Cnidaria, are specialized stinging cells used by cnidarians such as jellyfish, corals, and sea anemones for capturing prey and defense.

Step-by-step explanation:

Cnidocytes, which are specialized stinging cells known as nematocysts, are found in the phylum Cnidaria. These cells are essential for the survival of cnidarians as they play a critical role in capturing prey and defense. Cnidarians such as jellyfish, corals, and sea anemones are equipped with these cells, which can release toxins when triggered. The phylum Cnidaria showcases a more complex level of organization than the phylum Porifera (sponges), incorporating true tissues and radial symmetry.

With this in mind, the answer to the question is d. phylum Cnidaria. This phylum includes marine species that exhibit radial or biradial symmetry and are diploblastic, meaning they develop from two embryonic layers. Other phyla mentioned in the question, like Porifera, Nemertea, and Nematoda, do not have cnidocytes.

Answer 2

phylum Cnidaria

Step-by-step explanation:

Cnidocytes represent a group of living organisms, whose members are Jellyfish, Sea Anemone, Hydra, Portuguese Caravel. Cnidocytes are found in the Cnidaria phylum.

Cnidaria, known in the past as coelenterates, are relatively simple animals with no circulatory and respiratory system, all of which are done through the diffusion process. They have diffuse nervous system and metabolism products are eliminated by mouth. The locomotion occurs through jets of water in the jellyfish and some polyps move slowly dragging or somersaulting.