पूर्वोत्तर भारत में की जाने वाली 'झूम खेती' (स्थानंतरित कृषि) पारिस्थितिक रूप से मुख्य रूप से किस कारण से समस्याग्रस्त है?

Which of the following statements are correct regarding plantation farming in India? 1. Plantation farming involves the cultivation of a single crop over a large area. 2. It requires capital-intensive inputs and migrant labourers. 3. In India, tea in Assam and North Bengal, and rubber in Kerala and Karnataka are major plantation crops.

Rabi crops in India are generally sown in which of the following periods?