Answer : 4. "मक्का"
Explanation :

The cluster variety 'Mahi Kanchan' developed by the Agricultural Research Center, Banswara is related to maize crops.

2. Mahi Kanchan, Mahi Dhawal and Megha are varieties of maize. The major maize-producing districts in Rajasthan are Bhilwara, Chittorgarh, Udaipur, Banswara and Bundi.