A) multicellular with a gastrovascular system
B) multicellular having tissue organisation, but no body cavity
C) unicellular or acellular
D) multicellular without any tissue organization
Correct Answer: D
Solution :
Sycon belongs to phylum-Porifera. The porifers are most primitive group of multicellular animals. They have no tissue grade of organisation, and represent cell aggregated body plan; hence, included in the subkingdom Parazoa.
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