Autotrophs that have cell walls, roots, and leaves are primarily found in the kingdom Plantae. This kingdom includes all plants, ranging from small mosses to large trees. These organisms are characterized by their ability to perform photosynthesis, a process that allows them to convert sunlight into energy using chlorophyll.
The presence of cell walls made of cellulose provides structural support, while roots anchor the plant and help with nutrient uptake from the soil. Leaves are crucial for photosynthesis, maximizing the surface area exposed to sunlight. Overall, the features of cell walls, roots, and leaves are essential adaptations for life in terrestrial environments, making the kingdom Plantae unique among other biological kingdoms.