A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
In annelida, blood is red due to the presence of haemoglobin or erythrocruorin dissoved in plasma. RBCs are absent in them. Blood corpuscles are colourless. Instead of blood, leeches posses reddish haemocoelomic fluid that flows in haemocoelomic channels.
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