(N/A) $\rightarrow$ Some algae of commercial importance are:
$(1)$ Agar: It is derived from red algae $Gelidium$ and $Gracilaria$.
$\rightarrow$ Use: It is used as a culture medium in laboratories.
$(2)$ Algin and Carrageen: Algin is derived from brown algae and Carrageen is derived from red algae.
$\rightarrow$ Use: Used as a gelling agent in food and medical dressings.
$(3)$ Food: Many species of $Porphyra$,$Laminaria$,and $Sargassum$.
$\rightarrow$ Use: These marine algae are used as food items,especially in East Asian nations.
$(4)$ Fodder: Some brown algae like $Fucus$,$Sargassum$,$Laminaria$,$Macrocystis$,and $Rhodymenia$ are important fodder for cattle.
$(5)$ Alginic acid: $A$ phycocolloid obtained from brown algae such as $Alaria$,$Macrocystis$,$Ascophyllum$,and $Laminaria$. It is used as an emulsifier,thickener,and gelling agent in toothpastes,shaving creams,ice creams,emulsion paints,and shampoos.
$(6)$ Iodine source: $Fucus$ and $Laminaria$ are rich in iodine.
$(7)$ Medicinal: Some algae like $Corallina$ and $Polysiphonia$ have medicinal properties.
$(8)$ Protein supplements: Protein-rich algae like $Chlorella$ and $Spirulina$ are used as food supplements by sailors and space travelers.
$\rightarrow$ Some fungi of commercial importance:
$(1)$ Medicine: The fungus $Penicillium$ $notatum$ is used for producing antibiotics of the penicillin group.
$(2)$ Food processing: Yeast ($Saccharomyces$ $cerevisiae$) has been used for ages for fermentation. Alcoholic beverages and bakery items are produced via yeast fermentation.
$(3)$ Food: Some varieties of $Agaricus$ (mushrooms) are used as food in many countries.