Which among the following is true for fungi?
Fungi are not related to plants.
Yeast is a fungus.
Fungi are neither related to plants nor animals. In fact, they form a separate kingdom of life. Fungi are commonly used for a variety of purposes from making antibiotic medicines such as penicillin to making bread and beer. Yeast, of course, is used to ferment food to make bread and beer.
All fungi are strictly heterotrophic. They may be parasitic or saprophytic. Some fungi are indeed poisonous but many are edible. Mushrooms, for example, are eaten across the world and they really are the fruiting bodies of some fungi.