Question

Sycon belongs to a group of animals, which are best described as:

• A. Multicellular having tissue organization but not a body cavity
• B. Unicellular or acellular
• C. Multicellular without any tissue organization
• D. Multicellular with a gastro-vascular cavity

Answer 1

The correct option is C Multicellular without any tissue organization

All the members of the kingdom Animalia are multicellular but exhibit different levels of body organisation. Sycon belongs to phylum Porifera. Phylum Porifera is best described as a group of multicellular organisms with the cellular level of organisation. Cells are not grouped into tissues.

Organ level of organization with no body cavity is observed in flatworms, which are called acoelomates.

Gastro-vascular cavity is a common cavity for both the digestive and the circulatory functions, as seen in flatworms and cnidarians.