Which of the following is present in Pheretima ?

erythrocytes

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open circulatory system

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haemoglobin

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none of the above

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Solution

The correct option is C haemoglobin
Erythrocytes or RBC are cells present in the blood. They are absent in Pheretima. The blood vascular system of Pheretima is of closed type. It consists of the blood vessels, hearts, loops, capillaries and the blood glands. Open circulatory system is present in cockroaches. The blood consists of a pigment called haemoglobin which acts as the oxygen carrier in earthworms.

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