Who is responsible for wheat rust?

Thread-like filaments of fungi are known as:

Mycelium without cross-walls (aseptate and coenocytic) is found in:

Read the following statements and answer the question.
$(i)$ Some members are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling.
$(ii)$ They reproduce only by asexual spores known as conidia.
$(iii)$ Mycelium is septate and branched.
$(iv)$ Alternaria,Colletotrichum and Trichoderma are examples of this class.
Which of the following class of fungi is being described by the above statements?

$Rhizopus$ belongs to which class of fungi?

In which of the following is plasmogamy followed by karyogamy immediately?