To solve this problem, we need to identify what Alexander Von Humboldt described for the first time. Let's analyze the options:$\newline \bullet$Option 1: Laws of limiting factor.$\newline$ - The concept of limiting factors was developed by Justus von Liebig, not Alexander Von Humboldt.$\newline \bullet$Option 2: Species area relationships.$\newline$ - Alexander Von Humboldt is credited with describing the species-area relationship, which explains how the number of species increases with the area surveyed.$\newline \bullet$Option 3: Population growth equation.$\newline$ - The population growth equation is associated with Thomas Malthus and later refined by others, not Humboldt.$\newline \bullet$Option 4: Ecological biodiversity.$\newline$ - While Humboldt contributed to ecology, the specific term "ecological biodiversity" is not directly attributed to him.$\newline$Based on the analysis, the correct answer is Option 2: Species area relationships.$\newline$Therefore, the correct option is Option 2.