Solution:

• Palakkad pass – Largest pass in the Western Ghats,Connects Palakkad and Coimbathore.
• The gap affects the weather patterns in Southern India as it allows the moisture-laden Southwest monsoon winds into western Tamil Nadu, moderating summer temperatures and generating greater rainfall in the region relative to the rest of lowland Tamil Nadu.
• It affects rainfall activity in parts of tamilnadu likely Coimbatore, palladam, kangeyam, dharapuram, udumalai.
• It also allows the hot winds coming from Tamil Nadu which warm the eastern part of Kerala compared to the rest of the state and the tropical cyclone winds from Bay of Bengal bearing rain during the summer.