To solve this problem, we need to evaluate each statement and determine which one is correct. Let's analyze each option:$\newline \bullet$Option 1: The seed in grasses is not endospermic.$\newline$ - In grasses, the seed is typically endospermic, meaning it contains endosperm that provides nutrition to the developing embryo.$\newline$ - Therefore, this statement is incorrect.$\newline \bullet$Option 2: Mango is a parthenocarpic fruit.$\newline$ - Parthenocarpy refers to the development of fruit without fertilization, resulting in seedless fruit.$\newline$ - Mangoes develop from fertilized ovules and contain seeds, so they are not parthenocarpic.$\newline$ - Therefore, this statement is incorrect.$\newline \bullet$Option 3: A proteinaceous aleurone layer is present in maize grain.$\newline$ - Maize grains have an aleurone layer, which is rich in proteins and plays a role in seed germination by secreting enzymes.$\newline$ - Therefore, this statement is correct.$\newline \bullet$Option 4: A sterile pistil is called a staminode.$\newline$ - A staminode is a sterile or non-functional stamen, not a pistil.$\newline$ - Therefore, this statement is incorrect.$\newline$Based on the analysis, the correct statement is Option 3: A proteinaceous aleurone layer is present in maize grain.