Which category of gymnosperm is thought to have given rise to flower-bearing plants? Select one:

a.

Cycadophyta

b.

ginkgophyta

c.

Coniferophyta

d.

gnetophyta

d. Gnetophyta

Explanation:

Gymnosperms represent a group of "naked seed" plants which includes, among others, Cycads, Conifers and Gnetophytes. It has been proposed that Angiosperms or flowering plants, probably evolved from Gnetophyta about 150 million years ago. Gnetophyte is a group of Gymnosperms composed of only three living genera: Ephedra, Welwitschia and Gnetum. In Gnetum and Ephedra plants, researchers documented a regular process of double fertilization, which is a distinctive feature of Angiosperms. This important observation has been used to propose that Angiosperms evolved from Gnetophyta.

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