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$II.$ Tracheids/vessels elements are larger during periods when water is abundant
$III.$ Tracheids/vessels elements have thicker wall during periods of water deprivation
$IV.$ Wood formed in the previous years is darker than newer wood
Select the combination of correct statements from the options given below
$(i)$ Neurospora, which is used in biochemical and genetic work is a member of this class.
$(ii)$ They are mostly multicellular, e.g., Yeast, or rarely unicellular, e.g., Penicillium.
$(iii)$ They are saprophytic, decomposers, parasitic or coprophilous.
$(iv)$ Some examples are Aspergillus, Claviceps and Neurospora.