The epiblast is the outermost layer of cells in the blastoderm of an embryo. In certain monocotyledonous plants, the epiblast gives rise to the second cotyledon, which is a part of the embryo that stores and supplies nutrients to the developing plant. This cotyledon is also known as the scutellum.

Explanation:

- Monocotyledonous plants have seeds with only one cotyledon, which is the embryonic leaf that emerges from the seed upon germination.
- The monocot embryo consists of three main parts: the radicle, the embryonic root; the plumule, the embryonic shoot; and the scutellum, the structure that stores and supplies nutrients to the developing plant.
- In some monocotyledonous plants, such as maize, the epiblast gives rise to the scutellum, which is the second cotyledon.
- The scutellum is a flattened, shield-shaped structure that is located between the embryonic shoot and the endosperm.
- It is responsible for absorbing and transferring nutrients from the endosperm to the growing embryo.
- The scutellum also plays a role in the mobilization of stored nutrients during germination.
- Thus, the epiblast present in certain monocot embryos represents the second cotyledon or scutellum.

In summary, the epiblast is a layer of cells in the blastoderm of an embryo that gives rise to the scutellum in certain monocotyledonous plants. The scutellum is the structure that stores and supplies nutrients to the developing plant, and it plays a crucial role in seed germination and early plant development.

Because second cotyledon are not truly developed in monocot.