The residual, persistent nucellus in the seeds is termed as

Perisperm

The correct answer is Option (1) → Perisperm

Perisperm is a layer of nutritive tissue in the seed of certain flowering plants that are derived from the nucellus and surrounds the embryo. In seeds of some plants remnants of a nucellus is persistent. This residual, persistent nucellus is called perisperm. Perisperm is found in the seeds of a variety of plants, including black pepper and beet.