Which kingdom primarily consists of organisms that are autotrophic and photosynthetic and have cell walls made of cellulose?

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

Answer: (D)

Plants are organisms that make their own food through photosynthesis, using light energy to convert carbon dioxide and water into sugars. They contain chloroplasts with chlorophyll to drive this process, and their cell walls are made of cellulose, which provides rigidity and support. These features—autotrophic nutrition via photosynthesis and cellulose-based cell walls—identify the plant kingdom. Fungi have chitin walls and are heterotrophic; animals lack cell walls and rely on ingestion for nutrients; protists are a diverse group with varied nutrition and wall materials. So, the combination described points to plants.