Which kingdom includes a eukaryote that is photosynthetic and autotrophic?

• A. Protista
• B. Plantae
• C. Fungi
• D. Animalia

Answer: (B)

Plants are eukaryotic organisms that capture light energy through chloroplasts to drive photosynthesis, turning carbon dioxide and water into sugars. This makes them autotrophs, meaning they produce their own food rather than feeding on other organisms. Among the kingdoms listed, Plantae is the classic group that includes organisms with this combination: they are eukaryotic, photosynthetic, and autotrophic. Fungi and animals rely on consuming other organisms, so they are heterotrophs, and while some algae in Protista can be photosynthetic, the best-known and most representative example of a photosynthetic autotroph in a kingdom is Plantae. Therefore, Plantae is the correct choice.