Consider the following statements regarding cyclones:
- The engine of an extra-tropical cyclone is latent heat, whereas the engine of a tropical cyclone is condensation of air due to frontal uplift.
- Dissipation of an extra-tropical cyclone occurs due to occlusion, whereas a tropical cyclone dissipates due to the moisture supply being cut off.
- Usually, the direction of movement of an extra-tropical cyclone is from west to east and that of a tropical cyclone is from east to west.
- The area of impact of a tropical cyclone is much larger than that of an extra-tropical cyclone.
Which of the above statements are correct?
Correct answer: D
Explanation
Statement 1 is reversed: the tropical cyclone's engine is the latent heat of condensation over warm oceans, while the extra-tropical cyclone draws energy from frontal temperature contrasts. Statement 2 is correct, as extra-tropical cyclones decay through occlusion and tropical cyclones weaken once the moisture supply is cut off. Statement 3 is correct on the directions of movement. Statement 4 is wrong because extra-tropical cyclones cover a far larger area than tropical ones. So 2 and 3 are correct.