NEETZoologyBody Fluids and Circulation
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In a healthy individual with a total WBC count of 7000 /mm ^3 , the number of monocytes will be between 420 and 560 /mm ^3 . Reason (R): Monocytes are phagocytic cells which destroy foreign organisms entering the body. In the light of the above statements, choose the most appropriate answer from th
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
B. Both (A) and (R) are true but (R) is not the correct explanation of (A)
Step-by-step solution
Assertion (A) is true. Monocytes constitute 6 - 8 % of the total WBCs. For a total WBC count of 7000 /mm ^3 , the expected number of monocytes is calculated as 6 100 7000 to 8 100 7000 = 420 to 560 /mm ^3 . Reason (R) is true. According to NCERT, neutrophils and monocytes are phagocytic cells which destroy foreign organisms entering the body. However, Reason (R) is not the correct explanation of Assertion (A) because it explains their function rather than their relative percentage in the blood, which is the actual