Which kingdom includes multicellular organisms with cellulose cell walls and obtains energy through photosynthesis?

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

Answer: (A)

Classifying organisms by their cell structure and how they obtain energy helps distinguish major kingdoms. Multicellular organisms with cellulose-rich cell walls and the ability to carry out photosynthesis are characteristic of plants. The cellulose walls provide rigidity and form the ecological and structural framework of plant tissues, while chloroplasts with chlorophyll enable light capture and energy production through photosynthesis, making them autotrophs that synthesize their own sugars. Fungi have chitin in their cell walls and are heterotrophs, animals lack cell walls and are also heterotrophs, and protists are a diverse group that includes many unicellular or simple multicellular forms—some photosynthetic, some not. The combination of multicellularity, cellulose cell walls, and photosynthetic energy capture points to Plantae.