The groundnut kernels contain

1. 40 - 50% oil
2. no oil
3. 20 - 30% oil
4. 10 - 15% oil

Sugarcane can grow well in the alluvial soil. It should be rich in

1. Nitrogen
2. Calcium
3. Phosphorus
4. All the above

Crop rotation is done to

1. preserve the soil
2. preserve minerals in the soil
3. grow more crops
4. none of the above

Winnowing is associated with

1. rice crop
2. cotton crop
3. soya bean
4. wheat crop