Why are green algae placed in the Protista while plants are placed in a separate kingdom?
A) The green algae use chlorophyll a while plants use chlorophyll b.
B) Green algae have a cell wall of chitin while plants have cell walls of cellulose.
C) Plants enclose and protect the embryo within the female plant while green algae do not.
D) All plants are vascular while all green algae are non-vascular.
E) Algae are sporophytes that reproduce only asexually while plants are gametophytes and reproduce sexually.

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While algae and plants do share a number of similarities there are also some very important differences between the two. Among these differences are the protections and nourishment of the developing embryo, the formation of vascular tissue and the development of seeds as a means of reproduction.Bloom's

Why Are Green Algae Placed in the Protista While Plants