plants always have chloroplasts to help them with photosynthesis. fungi do not do photosynthesis, so an easy way to tell would be if the organism uses the sun and their energy source. but what if you don’t know that? a more obvious thing to look for is roots. plants use roots, stems, and leaves to circulate nutrients and waste in and out of their body. fungi spread a net like structure over the surface of wherever they are, making them more attached to their host instead of being in the ground