NEET BIOLOGY

Detailed explanation-1: -Sponges constitute the phylum Porifera, and have been defined as sessile metazoans (multicelled immobile animals) that have water intake and outlet openings connected by chambers lined with choanocytes, cells with whip-like flagella.

Detailed explanation-2: -Animals that are members of the phylum Porifera are all sessile.

Detailed explanation-3: -All adult sponges are sessile, meaning they live permanently attached to rocks or other submerged objects and do not move about on their own. Some sponges grow in thin encrusting layers over surfaces (Fig. 3.18 A). A few species can even bore into hard surfaces like clam shells, coral skeletons, and rock (Fig.

Detailed explanation-4: -Sponges are sessile, meaning they cannot move, they filter water to obtain their food. They don’t have brains, stomachs, or other organs. They do not even have true tissues. Instead, their bodies are made up of specialized cells (cell-level organization) that do specific jobs.