To solve this problem, we need to identify which plant produces a non-albuminous seed.$\newline$Let's analyze each option:$\newline \bullet$Maize:$\newline$ - Maize seeds are albuminous, meaning they retain some endosperm at maturity.$\newline \bullet$Castor:$\newline$ - Castor seeds are also albuminous, as they have a significant amount of endosperm.$\newline \bullet$Wheat:$\newline$ - Wheat seeds are albuminous, retaining endosperm as a food reserve.$\newline \bullet$Pea:$\newline$ - Pea seeds are non-albuminous, meaning they do not retain endosperm at maturity. Instead, the cotyledons absorb the nutrients.$\newline$Therefore, the correct answer is Option 4: Pea, as it produces non-albuminous seeds.