Question:medium

Increase in concentration of 'X' in blood of pregnant women who smoke may induce premature delivery. What is 'X'?

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Smoking increases CO levels, which competes with O$_2$ for hemoglobin, reducing oxygen supply to the fetus.
Updated On: Jun 9, 2026
  • CO
  • O$_2$
  • CO$_2$
  • NO$_2$
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The Correct Option is A

Solution and Explanation

Carbon monoxide (CO) binds to hemoglobin forming carboxyhemoglobin, reducing oxygen transport. In pregnant women, this can induce fetal hypoxia, increasing risk of premature delivery. Other gases listed do not have the same effect.
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