Question

which organisms are capable of performing photosynthesis?
only algae
plants, algae, and some bacteria
only plants
all eukaryotic organisms

Explanation:

Photosynthesis is a process where organisms convert light energy into chemical energy. Plants have chloroplasts for this. Algae, both unicellular and multicellular, can perform it. Some bacteria like cyanobacteria (blue - green bacteria) also have the necessary pigments (e.g., chlorophyll - like pigments) and mechanisms to carry out photosynthesis. Not all eukaryotic organisms can do photosynthesis (e.g., animals are eukaryotic but cannot). And it's not limited to only algae or only plants.

Answer:

Plants, algae, and some bacteria