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: -Ascon type of canal system It is found in asconoid type of sponges like Leucosolenia and also in some of the developmental stages of all the syconoid sponges.

Detailed explanation-3: -The simplest, or ascon, type, found only in certain primitive genera of the Calcarea (e.g., Leucosolenia), is characterized by an arrangement of choanocytes around a central cavity that directly communicates with the osculum.

Detailed explanation-4: -C) Leuconoid canal system: This is the most intricate system of canals. Due to the folding of walls of radial canals, it evolves from the syconoid form. In leuconoid sponges, this form of canal system is found.