Plant –Like Protists (Algae) *Most are multicellular, autotrophic eukaryotes. They lack true tissues – no true roots, stems or leaves. *Most have a flagella at some point in their life (reproduction) *They mostly use photosynthesis, but some eat other protists or absorb nutrients for food (euglenas). *Most are aquatic. *Reproduce asexually in a GREAT variety of ways. Some can sexually reproduce, but only when under envirionmental stress. *4 types of Alga body structures: 1. unicellular – aquatic plankton 2. colonial - volvox 3. filamentous - spirogyra 4. multicellular – kelp *Classified according to: 1. type of chlorophyll 2. pigments (color) 3. form of food storage 4. cell wall composition *Adaptations & Evolution: Evolve into land plants as evidenced by the fact that both land plants and algae have chlorophyll a & b, both store starch as food, both have cell walls made of cellulose, and both go through alternation of generations in their life cycles.