The Chloroplasts of Green Algae and Land Plants Have Two

Multiple Choice

The chloroplasts of green algae and land plants have two membranes.These chloroplasts were acquired through endocytosis of a cyanobacterium containing chlorophyll and possessing a double membrane.What two events would explain why the chloroplasts of euglenids (a unicellular clade) have three membranes yet contain the same photosynthetic pigments as both green algae and land plants?

A) Plants arose from green algae and engulfed a euglenid to acquire photosynthetic pigments.
B) The ancestral euglenid engulfed a green alga through secondary endosymbiosis, while a different green alga became the ancestor to plants.
C) Ancestral green algae engulfed a euglenid through secondary endosymbiosis and gave rise to green plants.
D) Ancestral green plants arose from euglenids and then engulfed photosynthetic green algae.
E) Green plants engulfed a photosynthetic euglenid and were ancestral to green algae.