Which one is not an obligate parasitic fungus?

Correct option is C

· Correct answer: (c) Alternaria
· Alternaria is not an obligate parasitic fungus; it is a facultative parasite, meaning it can survive as a saprophyte (living on dead organic matter) as well as a parasite.
Other options:
· (a) Albugo: An obligate parasitic fungus affecting cruciferous plants.
· (b) Erysiphe: Obligate parasite causing powdery mildew on many plants.
· (d) Peronospora: An obligate parasitic fungus causing downy mildew in plants.