Animals devoid of respiratory, excretory and circulatory organs are belong to phylum [DPMT 2004]
A) Echinodermata B) Platyhelminthes C) Porifera D) Mollusca
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The phylum porifera commonly called sponges ad these animals only have tissue level of organisation. So no organs....
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‘Animals devoid’ of respiratory, circulatory, and excretory organs are belong to ‘phylum’ is Porifera.
Option: C
Explanation:
- Animals devoid of respiratory, circulatory and excretory organs belong to the ‘Phylum Porifera’. Phylum Porifera is comprised of sponges.
- They are multicellular, diploblastic organisms, usually marine and sedentary, sometimes free-floating. They lack true tissues.
- They have an opening called the Ostia through which ‘water enters the body’ and through ‘radial canals’ that are lined by flagellated cells.
- Water is passed out through an ‘opening’ called the Oscula. Respiration takes place by diffusion of oxygen from the water, Circulation takes place through the canal system and excretion of ammonia occurs through pores.
Learn more about Porifera
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