Correct option:The imperfect fungi which are decomposers of litter and help in mineral cycling belong to Deuteromycetes.

Solution:

• The imperfect fungi which are decomposers of litter and help in mineral cycling belong to the class Deuteromycetes.
• They are considered as imperfect because in these fungi, no sexual reproduction is yet discovered.
• The asexual reproduction takes place by the help of conidia formation.