The crop which can be processed into powered form for effective preservation include the following except

All the crops listed in the options can be processed into a powdered form for effective preservation except for kolanut. Maize, yam, pepper, and soya bean can all be processed into a powdered form for preservation. Powdering these crops makes them last longer and helps to retain their nutritional value. Maize can be dried and ground into cornmeal, yam can be sliced and dried before grinding into flour, pepper can be ground into powder, and soya bean can be roasted, ground, and used as a protein supplement. Kolanut, on the other hand, is a bitter stimulant that is commonly used in social and cultural events in Nigeria. While it can be processed into various forms for consumption, it is not typically processed into a powdered form for preservation.