MCQ practice · SSC Biology Board questions · Chapter 6: Transport in Organisms
How many thousand white blood cells are in a cubic millimetre of human blood?
Think it through first, then pick an option.
- a 4-10 thousand
- b 10-15 thousand
- c 15-20 thousand
- d 20-25 thousand
Answer and explanation
Correct answer: a 4-10 thousand
A healthy person has 4-10 thousand white cells per cubic millimetre.
Why the other options are wrong
- b 10-15 thousand: 10-15 thousand is too many; the count rises in illness, not in health.
- c 15-20 thousand: 15-20 thousand is far above normal. The right choice is: 4-10 thousand.
- d 20-25 thousand: 20-25 thousand is far above normal. The right choice is: 4-10 thousand.
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