WAEC Agricultural Science 1996 Question 36

A great disadvantage of introduction as a method of crop improvement is the

1. A.adaptation of introduced crop to a new area of cultivation
2. B.usefulness of an introduced crop as basis for a breeding programme
3. C.incorporation of the desirable characteristics of the introduced crop into the local crop
4. D.introduction of a new type of disease into a new area of cultivation
5. E.integration of the introduced variety into the agricultural production of a new area.