Animal Kingdom Question 1028
Question: Sycon belongs to a group of animals which are best described as
[CBSE PMT 2003]
Options:
A) Unicellular or acellular
B) Multicellular without any tissue organisation
C) Multicellular with a gastrovascular
D) Multicellular having tissue organisation, but no body cavity
Show Answer
Answer:
Correct Answer: B
Solution:
Sycon is a sponge. Sponges belong to phylum Porifera. Sponges are the most primitive of multicellular animals.
These animals exhibit only the cellular levels of body organisation and thus, are considered as the simplest forms among the metazoans. The restriction to the cellular levels of body organisation means that functions are carried out by individual cells or aggregate of cells.
• Sponges do not have a digestive system and respiratory system. The functions associated with these organs are performed by canal system.
• All sponges have a central body cavity called spongocoel which is lined by choanocytes or collar cells.
BETA
