The difference between perisperm and endosperm is that perisperm:

The correct option is "is a diploid tissue".

To understand why this statement is correct, we can compare the origin, development, and ploidy of perisperm and endosperm in seeds:

1. Perisperm:
Perisperm is the persistent remnant of the nucellus that remains in some seeds (such as black pepper, coffee, and beet) after embryo development. Because the nucellus is a maternal tissue of the ovule, it does not undergo fertilization. As a result, it retains the diploid chromosome number of the parent plant. Thus, perisperm is a diploid (2ⁿ) tissue.

2. Endosperm:
In contrast, the endosperm is formed through the process of double fertilization in angiosperms. Specifically, it arises from "triple fusion," where a haploid male gamete (ⁿ) fuses with the diploid secondary nucleus (2ⁿ) in the embryo sac. This fusion produces a triploid (3ⁿ) nutritive tissue.

Therefore, the key distinction is that perisperm is a diploid tissue, whereas the endosperm is triploid.