Final answer:
Plants are multicellular eukaryotes that carry out photosynthesis, have cell walls made of cellulose, and function as producers. They contain chloroplasts and are autotrophic, differentiating them from other organisms like fungi and certain protists.
Step-by-step explanation:
Plants are multicellular eukaryotic organisms that perform photosynthesis using chloroplasts. They are characterized by having cell walls made of cellulose, a feature that provides structural support. Deemed producers in the food web, plants capture the energy of sunlight and convert carbon dioxide from the air into glucose, a process essential for life on Earth.
Among eukaryotic cells, plant cells are unique for containing chloroplasts, the site of photosynthesis, and for their ability to generate their own food, making them autotrophs. Plants also play a crucial role in ecosystems as they provide oxygen as a byproduct of photosynthesis, contribute to carbon fixation, and form the basis in the hierarchy of consumption by serving as food for herbivores and omnivores alike.