Plants can be either photosynthetic or non-photosynthetic. Photosynthetic plants such as most plants, algae, and bacteria use photosynthesis to convert sunlight, carbon dioxide, and water into oxygen and energy in the form of glucose. Non-photosynthetic plants include parasites and fungi that obtain nutrients from host organisms. The document discusses the kingdoms that contain photosynthetic organisms like Monera, Protistia, and Plantae and describes characteristics of photosynthetic and non-photosynthetic plants. Examples of non-photosynthetic plants mentioned are Indian pipes and dodder.