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| Q. |
Which of the following pairs has open type of circulatory system? |
| A. | Earthworm and Leech |
| B. | Man and Whale |
| C. | Cockroach and Silverfish |
| D. | Tadpole larva and Fish |
| Answer» C. Cockroach and Silverfish | |
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Explanation: The open circulatory system is common to mollusks and arthropods. Open circulatory systems pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. Cockroaches and silverfish have an open circulatory system. They don't have any blood vessels. |
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