Explanation
The presence of chlorophyll is the compelling feature to keep prokaryotic algae with plants. Chlorophyll is the primary pigment that is responsible for capturing light energy during photosynthesis. Both prokaryotic algae and plants use chlorophyll to carry out photosynthesis, which is the process of converting light energy into chemical energy. Therefore, the presence of chlorophyll is a significant similarity between prokaryotic algae and plants, which supports the classification of prokaryotic algae as a type of plant.
The absence of a nucleus, the presence of a cell wall, and the absence of contractile vacuoles are not unique features to prokaryotic algae, as other organisms such as bacteria also possess these traits.
