Genus $Penicillium$ belongs to the class:

Dikaryon formation is the characteristic feature of

In fungi,the oogamous type of sexual reproduction refers to .......

There is a myth that immediately after heavy rains in forests, mushrooms appear in large numbers and form a very large ring or circle, which may be several metres in diameter. These are called as "fairy rings". Can you explain this phenomenon of fairy rings in biological terms? Discuss the mycelial structure in $Agaricus$ and its soil-borne nature.

Identify the importance of the following fungi:
$(i)$ $Penicillium$
$(ii)$ $Neurospora$

Neurospora,an ascomycetes fungus,has been used as a biological tool to understand the mechanism of plant genetics in much the same way as Drosophila has been used to study animal genetics. What makes Neurospora so important as a genetic tool?