試題詳解

21. In the evolution of vascular plants, there is a trend toward the
(A) above-ground parts becoming structurally similar to the below-ground parts.
(B) progressive reduction of the sporophyte.
(C) sporophyte becoming nutritionally dependent on the gametophyte.
(D) increased protection of the gametophyte by the sporophyte.
(E) production of seeds in all lineages.