The statement that all fungi are multicellular is false.
While many fungi, such as mushrooms and molds, are indeed multicellular organisms, there are also unicellular fungi, with yeasts being the most notable example. Yeasts are single-celled fungi that play a crucial role in various processes, including fermentation and baking. Thus, it is important to recognize that the fungal kingdom comprises both multicellular and unicellular forms, making the blanket statement inaccurate.