Which of the following is unique to the molluscs and has no equivalent in any other animal?
1. | Haemocoel | 2. | Hemocyanin |
3. | Radula | 4. | Metamerism |
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1. | It is the second largest animal Phylum after Phylum Arthropoda. |
2. | It includes animals that are bilaterally symmetrical, triploblastic, and coelomate. |
3. | Body is covered with a calcareous shell and is metamerically segmented with a distinct head, muscular foot, and visceral hump. |
4. | Gills are present in the mantle cavity, a space between the mantle and the hump. |
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1. | Pinctada | Pearl Oyster |
2. | Aplysia | Sea hare |
3. | Dentalium | Tusk shell |
4. | Loligo | Devil fish |
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A: | I is found in all the molluscs. |
B: | II is a cavity used for egestion, excretion and respiration. |