Leucocytes are colourless due to

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(B) Leucocytes,also known as white blood cells $(WBCs)$,are colourless because they lack the respiratory pigment haemoglobin,which is present in red b

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Lack of haemoglobin

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(B) Leucocytes,also known as white blood cells $(WBCs)$,are colourless because they lack the respiratory pigment haemoglobin,which is present in red blood cells $(RBCs)$.Because they do not contain haemoglobin,they appear white or colourless under a microscope.They are nucleated and are generally larger than $RBCs$.The normal count of $WBCs$ in human blood is $6000-8000$ per $mm^3$.$A$ decrease in their count is known as leukopenia,while an abnormal increase is often associated with conditions like leukaemia.The average lifespan of $WBCs$ in humans ranges from $10$ to $30$ days.

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