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प्रश्न
Which special cells are present in the body of sponges (Porifera)?
विकल्प
Collar cells
Cnidoblasts
Germ cells
Ectodermal cells
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उत्तर
Collar cells
Explanation:
Porifera organisms are attached to the substrate. They do not show locomotion. To collect and capture food, they must generate a current in the water. They possess characteristic collar cells throughout their bodies for this reason. Germ cells and ectodermal cells are present in all other phyla. Cnidoblasts are a characteristic feature of coelenterates.
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संबंधित प्रश्न
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Write a short note.
Collar cells
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| Phylum/Class | Excretory Organ | Circulatory Organ | Respiratory Organ |
| Arthropoda | Lungs/Gills/ Tracheal System | ||
| Nephridia | Closed | Skin/parapodia | |
| Metanephridia | Open | ||
| Amphibia | Closed | Lung |
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