Which of the following are correct about the slime moulds?
I. During unfavourable conditions, plasmodium differentiates and produces fruiting bodies as sporangium.
II.  Spores possess cell wall.
III.  Spores are dispersed by air current.
IV.  Being extremely resistant, spores survive for many years.

Slime moulds are saprophytic protists. The body moves along decaying twigs and leaves engulfing organic material. Under suitable conditions, they form an aggregation called plasmodium which may grow and spread over several feet. During unfavourable conditions, the plasmodium differentiates and forms fruiting bodies bearing spores at their tips. The spores possess true walls. They are extremely resistant and survive for many years, even under adverse conditions. The spores are dispersed by air currents.