name the following proteinaceous endorluleterne of porifera ------
Answers
Explanation:
Locomotion. Sponges are generally sessile as adults and spend their lives attached to a fixed substratum. They do not show movement over large distances as do free-swimming marine invertebrates. However, sponge cells are capable of creeping along substrata via organizational plasticity.
endoskeleton
Sponges have an internal skeleton that gives them support and protection. An internal skeleton is called an endoskeleton. A sponge endoskeleton consists of short, sharp rods called spicules (see Figure below). Spicules are made of silica, calcium carbonate, or spongin, a tough protein.
Answer:
As larvae, sponges are able to swim, but as adults, they are sessile, spending their life attached to a substrate.
Although the majority of sponges live in marine habitats, one family, the Spongillidae, is found in fresh water.
Calcarea, Hexactinellida, Demospongiae, and Homoscleromorpha make up the four classes of sponges; each type is classified based on the presence or composition of its spicules or spongin.
Most sponges reproduce sexually; however, some can reproduce through budding and the regeneration of fragments.
The majority of sponges are filter-feeders, but a few species are carnivorous due to the nutrient -poor environment in which they are found.