Q. Which among the following conditions is/are favourable for the formation of Cyclone?

1. Low sea surface with temperature lower than 27° C.
2. Presence of the Coriolis force 
3. Small variations in the vertical wind speed
4. Upper divergence above the sea level system

Select the correct code from the options given below:
Answer: Only 2, 3, & 4
Notes: Cyclone is any low-pressure area with winds spiralling inwards.
Conditions Favourable for Tropical Cyclone Formation include:
Large sea surface with temperature higher than 27° C,
Presence of the Coriolis force enough to create a cyclonic vortex,
Small variations in the vertical wind speed,
A pre-existing weak low-pressure area or low-level-cyclonic circulation,
Upper divergence above the sea level system.