Q155 (2024)
The WBC count of a person's blood sample is $8000 / \mathrm{mm}^3$. How many eosinophils and lymphocytes would be in the same blood sample approximately?
- $160 - 240 / \mathrm{mm}^3$ and $1600 - 2000 / \mathrm{mm}^3$ respectively
- $100 - 120 / \mathrm{mm}^3$ and $160 - 200 / \mathrm{mm}^3$ respectively
- $300 - 500 / \mathrm{mm}^3$ and $500 - 700 / \mathrm{mm}^3$ respectively
- $300 - 500 / \mathrm{mm}^3$ and $1200 - 1500 / \mathrm{mm}^3$ respectively
### Related Formula
$$\text{Eosinophils} = 2 - 3\% \text{ of Total WBC}$$
$$\text{Lymphocytes} = 20 - 25\% \text{ of Total WBC}$$
### Core Logic
Given Total WBC count = $8000 / \mathrm{mm}^3$.
1. Eosinophils (2–3%):
$$\text{Count} = \frac{2}{100} \times 8000 \text{ to } \frac{3}{100} \times 8000 = 160 - 240 / \mathrm{mm}^3$$
2. Lymphocytes (20–25%):
$$\text{Count} = \frac{20}{100} \times 8000 \text{ to } \frac{25}{100} \times 8000 = 1600 - 2000 / \mathrm{mm}^3$$
### Step 1: Conclusion
Eosinophils = $160 - 240 / \mathrm{mm}^3$ and Lymphocytes = $1600 - 2000 / \mathrm{mm}^3$.
### Pattern Recognition
Sees: "8000 WBC count eosinophils lymphocytes calculation".
Shortcut: 2–3% of 8000 = 160–240; 20–25% of 8000 = 1600–2000.
### Evaluation Rubric / Model Answer
null
### Chapter Mix
Class 11 Biology: Body Fluids and Circulation
