Fungal members like Mucor and Rhizopus, or some as parasitic fungi on mustard, are associated with which group?

Phycomycetes

The correct answer is option (3) - Phycomycetes

Members of phycomycetes are found in aquatic habitats and on decaying wood in moist and damp places or as obligate parasites on plants. The mycelium is aseptate and coenocytic. Asexual reproduction takes place by zoospores (motile) or by aplanospores (non-motile). These spores are endogenously produced in sporangium. A zygospore is formed by fusion of two gametes. These gametes are similar in morphology (isogamous) or dissimilar (anisogamous or oogamous). Some common examples are Mucor , Rhizopus (the bread mould mentioned earlier) and Albugo (the parasitic fungi on mustard).