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The following plants without root and leaf differentiation are () A. Gelidium B. Apple C. Ginkgo D. Pteridium aquilinum.
A. Gelidium belongs to algae and has no differentiation of roots and leaves. A is correct;

B. Apples belong to angiosperms, and have six organs: root, stem, leaf, flower, fruit and seed. B error;

C. Ginkgo biloba belongs to gymnosperms, with no flowers and bare seeds, which cannot form fruits. There are only four organs: root, stem, leaf and seed. C is wrong.

D. Pteridophytes belong to pteridophytes, with differentiated roots, stems and leaves, and conductive tissues in the body, which are generally tall and straight, and D is wrong;

So choose: a