Question

In terms of descending order of percentage proportions of leukocytes in human blood, which one is correct?

• A. Neutrophils $ \, \rightarrow $ lymphocytes $ \, \rightarrow $ monocytes $ \, \rightarrow $ eosinophils $ \, \rightarrow $ basophils
• B. Neutrophils $ \rightarrow $ basophils $ \, \rightarrow $ lymphocytes $ \rightarrow $ eosinophils $ \rightarrow $ monocytes
• C. Neutrophils $ \rightarrow $ monocytes $ \rightarrow $ lymphocytes $ \, \rightarrow $ eosinophils $ \, \rightarrow $ basophils
• D. Neutrophils $ \, \rightarrow $ eosinophils $ \, \rightarrow $ basophils $ \, \rightarrow $ lymphocytes $ \, \rightarrow $ monocytes

Answer 1

Answer: (A)

WBCs are also called leucocytes as they are colourless. They are of two types based on nucleus shape and nature of cytoplasm-
Granulocytes:- They are polymorphonuclear WBC and are produced in Bone Marrow. They are acidophils, basophils and neutrophils.
Agranulocytes:- They are mononuclear WBC and are produced n bone marrow. They are monocytes and lymphocytes.
Based on their abundance in blood, the leucocytes are arranged in the following descending manner-
Neutrophils -- lymphocytes -- monocytes -- eosinophils -- basophils