To solve this problem, we need to identify what the persistent nucellus in the seed is known as. Let's analyze the options:$\newline \bullet$Option 1: Chalaza - The chalaza is the region of the ovule where the integuments and nucellus are joined. It is not related to the persistent nucellus.$\newline \bullet$Option 2: Perisperm - The perisperm is the term used for the persistent nucellus in the seed. It is the nutritive tissue derived from the nucellus.$\newline \bullet$Option 3: Hilum - The hilum is the scar on the seed coat through which the seed was attached to the ovary wall. It is not related to the nucellus.$\newline \bullet$Option 4: Tegmen - The tegmen is the inner layer of the seed coat, not related to the nucellus.$\newline$Based on the analysis, the correct answer is Option 2: Perisperm.