Final answer:
Sponges are multicellular organisms from the phylum Porifera with specialized cells but no true tissues. They demonstrate a primitive form of multicellularity, lacking organized tissues. The false statement is that 'Pinacocytes can transform into any cell type', as they serve a more protective role.
Step-by-step explanation:
The correct option : a
Sponges are multicellular organisms belonging to the phylum Porifera. These aquatic invertebrates are characterized by their bodies full of pores, allowing water to circulate through them. Unlike true multicellular organisms with organized tissues, sponges consist of various specialized cell types that perform distinct functions but are not organized into interconnected tissues. Sponges have a basic body plan with a jelly-like mesohyl acting as an endoskeleton, and an outer layer formed by pinacocytes.
Cells such as choanocytes with flagella propel water through the sponge, contributing to its filter-feeding mechanism. Notably, these cells cannot survive in isolation when they are separated from the colony; they need each other to rebuild the structure of the sponge if it becomes fragmented. It is important to note that the statement 'Pinacocytes can transform into any cell type' is false. Pinacocytes are more so the protective outer cells that do not transform into other types. In summary, based on their cellular organization and functionality, sponges demonstrate a primitive form of multicellularity in the animal kingdom.