Explanation:

 1. Cassava, a crop of food security for people of Kerala until the 19th century is now cultivated in an area of 1.04 lakh ha producing 24.13 lakh tonnes. Thiruvananthapuram and Kollam are the major districts in Kerala cultivating
cassava. Formerly a crop mainly of upland conditions until the seventies, it started occupying low land areas replacing paddy. It is cultivated under different croppingsystems in Kerala i.e., as mono and as
inter crop in coconut (in both upland and low land) and banana (low land), rubber (juvenile phase) orchards in upland conditions and as a mixed crop in homestead gardens.

2.  Gujarat is the largest producer of cotton in India, followed by Maharashtra.

3.  Third and fourth are correct.