B and C are the correct statements. Jhum cultivation or shifting cultivation It is an agricultural system in which plots of land are cultivated temporarily, then abandoned while post- disturbance fallow vegetation is allowed to freely grow while the cultivator moves on to another plot. This system is majorly practiced in northeastern states of India like Arunachal Pradesh, Meghalaya, Mizoram, and Nagaland. Traditionally fallow period is 10-20 years but in recent times it has been reduced to 2-5 years. It is a non-scientific form of agroforestryTaungya cultivation:Taungya is a system of forest management in which land is cleared and planted initially for food crops. It is practiced in states like Kerala, West Bengal, Orissa, Karnataka, and NE states. It is scientifically modified shifting cultivation. Coconut based agroforestry:It is agriculture along with woody component with coconut plant compulsory. In India, Coconut based agroforestry is generally found in tropical and subtropical areas and is characterized by high species diversity.