Question

Read the given statements and select the correct option.

Statement 1: Traffic jams are likely to cause giddiness, exhaustion, reduced vision, etc.
Statement 2: Carbon monoxide from vehicles causes these problems by reducing $O_2$ -carrying capacity of hemoglobin.

• A. Both statements 1 and 2 are correct.
• B. Statement 1 is correct but statement 2 is incorrect.
• C. Statement 1 is incorrect bu statements 2 is correct.
• D. Both statements 1 and 2 are incorrect.

Answer 1

The correct option is A Both statements 1 and 2 are correct.

50% of Carbon monoxide emissions are from automobiles. Normally CO has a brief residence in atmosphere and gets oxidized to co2. However, in congested and closed areas if proves quite harmful. Carbon monoxide combines with haemoglobin, produces carboxyhaemoglobin or COHb. At 50 ppm, CO converts 7.5% of haemoglobin into carboxyhemoglobin within 8 hours. It impairs oxygen transport resulting in giddiness, headache, decreased vision, cardiovascular malfunction, and asphyxia.

So, the correct answer is 'Both statements 1 and 2 are correct'