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Question
Write a short note.
Collar cells
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Solution
- Collar cells are special types of cells present in animals belonging to the phylum Porifera.
- Collar cells help in the movement of water within the body.
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| Column I | Column II |
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| B. Aschelminthes | ii. Water-vascular system |
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| D. Arthropoda | iv. Jointed appendages |
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Fill up the blank spaces appropriately
| 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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