In Aquatic Environments, Nutrients Are Readily Available to Cells in the Thallus

In aquatic environments, nutrients are readily available to cells in the thallus by simple diffusion from the surrounding water. Thus a holdfast simply anchors algae to hard substrata. On land, however, plants require nutrients and water from the soil and the substratum is relatively soft and unstable. The evolution of roots rather than rhizoids represented a significant step forward in colonising and exploiting terrestrial habitats. The most primitive plants with roots are the

A) mosses.
B) psilophytes.
C) ferns.
D) clubmosses.
E) horsetails.

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