Q. With reference to the Inter-Tropical Convergence Zone (ITCZ), which of the following statements is/are correct?
1. In July, it shifts southwards and becomes a reason for Southwest monsoon.
2. It is a low-pressure zone located at equator where trade winds converge.
Select the correct answer using the codes given below:

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B

The Inter Tropical Convergence Zone (ITCZ) is a low-pressure zone located at the equator where trade winds converge, and so, it is a zone where air tends to ascend.  

  • In July, the ITCZ is located around 20°N-25°N latitudes (over the Gangetic plain), sometimes called the monsoon trough.  
  • This monsoon trough encourages the development of thermal low over north and northwest India.  
  • Due to the shift of ITCZ, the trade winds of the southern hemisphere cross the equator between 40° and 60°E longitudes and start blowing from southwest to northeast due to the Coriolis force.  
  • It becomes southwest monsoon. In winter, the ITCZ moves southward, and so the reversal of winds from northeast to south and southwest, takes place. They are called northeast monsoons. 

Source: NCERT – India Physical Environment