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B
Formation of phagocytes
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C
Maintenance of blood volume
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D
Maintenance of blood circulation
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Solution
The correct option is B Formation of phagocytes Blood glands are present on the 4th,5th and 6th segments. They produce blood cells and haemoglobin which is dissolved in blood plasma. Blood cells are phagocytic in nature. The blood vascular system of Pheretima is of closed type. It consists of the blood vessels, hearts, loops, capillaries, and the blood glands. Hence blood glands help in the formation of phagocytes.
So the correct answer is 'Formation of phagocytes'.