Which of the following seeds is primarily known for containing a large perisperm?

The seed primarily known for containing a large perisperm is castor. The perisperm is a tissue that surrounds the embryo and provides it with nourishment during germination. In the case of castor beans, the perisperm is significant in volume and plays a crucial role in supplying nutrients to the developing plant embryo.

Castor seeds have a distinct structure, where the perisperm is well developed and fleshy, enabling the seed to store energy that helps in the early growth stages. This characteristic is particularly important for seeds that may not have ample access to nutrients in the soil initially.

In contrast, other seeds such as peanut, soybean, and wheat do not rely heavily on the perisperm for nourishment. Instead, they typically utilize cotyledons as the primary nutrient storage organs. For example, peanuts and soybeans have substantial cotyledons that provide necessary energy during germination, while wheat seeds store their nutrients in the endosperm, not perisperm. Thus, when discussing seeds with a significant amount of perisperm, castor is the clear example.