EVERYDAY SCIENCE

Detailed explanation-1: -Leuconoid is the most complicated sponge body plan. Instead of a spongocoel, the canal system in these sponges produces a more complex branched network, with canals leading to digestive chambers. Choanocytes line the digestive chambers rather than the canals in Leuconoid sponges.

Detailed explanation-2: -These canals are lined by collar cells, the flagellae of which move water from the outside, into the spongocoel and out the osculum. The third category of body organization is leuconoid. These are the largest and most complex sponges. These sponges are made up of masses of tissue penetrated by numerous canals.

Detailed explanation-3: -Demosponges constitute about 90% of all known sponge species, including all freshwater ones, and they have the widest range of habitats.

Detailed explanation-4: -(3) Leuconoid sponges have the most complex organization, which permits for an increase in body size. Clusters of flagellated chambers are filled from incurrent canals and discharge their water via excurrent canals into a central osculum.

Detailed explanation-5: -The most complex sponge body plan is called leuconoid. In these sponges the canal system forms a more elaborate branched network, and the canals lead to digestive chambers instead of a spongocoel. In leuconoid sponges the choanocytes line the digestive chambers and not the canals.