MCQ practice · SSC Biology Board questions · Chapter 6: Transport in Organisms
Because of the presence of which does blood look red?
Think it through first, then pick an option.
- a Potassium
- b Calcium
- c Iron
- d Magnesium
Answer and explanation
Correct answer: c Iron
The iron of haemoglobin makes blood look red (an exam fact beyond the book).
Why the other options are wrong
- a Potassium: Potassium does not make blood red. The right choice is: Iron.
- b Calcium: Calcium is for clotting, not for the red colour.
- d Magnesium: Magnesium is in leaf chlorophyll and does not colour blood.
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