NEET · Biology · STD 11 - 15. Body fluids and criculations

The WBC count of a person's blood sample is \(8000 / cu . mm\). How many eosinophils and lymphocytes would be in the same blood sample approximately ?

A \(300-500\) /cu.mm and \(1200-1500\) /cu.mm, respectively
B \(160-240 /\) cu.mm and \(1600-2000 /\) cu.mm, respectively
C \(300-500 /\) cu.mm and \(500-700 /\) cu.mm, respectively
D \(100-120 /\) cu.mm and \(160-200 /\) cu.mm, respectively

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Answer & Solution

Correct Answer

(B) \(160-240 /\) cu.mm and \(1600-2000 /\) cu.mm, respectively

Step-by-step Solution

Detailed explanation

(B) \(160-240 /\) cu.mm and \(1600-2000 /\) cu.mm, respectively
Total WBC count \(=8000 / cu . mm\).
Eosinophils constitute \(2-3 \%\) of total WBCs.
Number of eosinophils \(=\frac{2}{100} \times 8000\) to \(\frac{3}{100} \times 8000=160-240 /\) cu.mm.
Lymphocytes constitute \(20-25 \%\) of total WBCs.
Number of lymphocytes \(=\frac{20}{100} \times 8000\) to \(\frac{25}{100} \times 8000=1600-2000 /\) cu.mm.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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