Where should the loss of flagellated sperm be marked on the phylogenetic tree?

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Where should the loss of flagellated sperm be marked on the phylogenetic tree?

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No options provided. They are:

a.) At the base of a seed plant

b.) At the base of angiosperms and at the base of the cover of gnetophytes, pines, and redwoods

c.) At the base of the cover are gnetophytes, pines, and redwoods

d.) At the base of angiosperms

b.) At the base of angiosperms and at the base of the cover of gnetophytes, pines, and redwoods

Explanation:

The phylogenetic tree of plants was made according to different characteristics. Once vascular tissue entered the tree, it was divided into seedless vascular plants and seed vascular plants. Till this time flagellated sperm was observed in plants.

When the breeding vascular plants were divided into angiosperms and gymnosperms, flagellated sperm were first lost at the base of angiosperms. None of the angiosperms have flagellated sperm. Gymnosperms were divided into two shores. The clade containing ginko and cycads still kept the sperm flagellated. But the cover that contained gnetophytes, pine trees and red woods lost flagellated sperm. So the characteristic of flagellated sperm was lost again at the base of gnetophytes, fir trees, and clade redwoods.

Accordingly, the loss of flagellated sperm should be marked on the phylogenetic tree at the base of angiosperms and at the base of the cover of gnetophytes, pines, and redwoods.