प्राचीन / प्रारंभिक जीविका निर्वाह कृषि में निम्नलिखित में से किस उपकरण का उपयोग नहीं किया जाता है?

Soyabean cultivation in Madhya Pradesh was first started in which district?

Which of the following is primarily classified as a commercial cash crop?

What is the defining characteristic of perennial crops, such as mango and coconut?