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Q. No.Which of the following is not true about the blood vascular system of cockroach?
| 1. | It is of open type. |
| 2. | It delivers oxygen to the tissues. |
| 3. | Heart lies along the mid dorsal line of thorax and abdomen. |
| 4. | The haemolymph is composed of colourless plasma and haemocytes. |
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Subtopic: Â Cockroach: Circulatory System |
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