Chlamydomonas and Spirogyra belong to algae plants. Algae plants are simple in structure, with no differentiation in roots, stems and leaves. Cells contain chloroplasts, which can carry out photosynthesis and produce organic matter. Nutrition is autotrophic, which is an important feature of various green plants.
So the answer is: photosynthesis, organic matter, autotrophic, autotrophic.