Among cultivated plants such as gooseberries, currants, pumpkin, a wide variety of fruits is observed, while the variety of leaves

Among cultivated plants such as gooseberries, currants, pumpkin, a wide variety of fruits is observed, while the variety of leaves is not found in them. On the contrary, different varieties of cabbage have changeable leaves. What explains the difference in the nature of organ variability in cultivated plants?

The variety of fruits of such cultivated plants as gooseberries, currants, pumpkin is associated with selection. In the course of artificial selection made by man, these plants have a wide variety of fruits, but the variety of leaves is not observed, since they are of no interest to humans, that is, for selection. And in natural conditions, on the contrary, the leaves can perform a protective function, which is why a variety of leaf forms arises, it depends on the conditions in which this or that plant grows.