In the grass family the cotyledon is called:

Scutellum

The correct answer is Option (2) → Scutellum

The scutellum is a specialized structure found in the embryo of grasses, including wheat. It is a single, large, shield-shaped cotyledon that is responsible for nutrient absorption during germination. The scutellum plays a vital role in providing nutrients to the developing seedling until it can establish its own photosynthetic capabilities. Therefore, the large, shield-shaped cotyledon in the wheat grain is known as the scutellum.

At the lower end of the embryonal axis, there is a structure called the coleorrhiza, which encloses the radicle (root tip) and the root cap. The coleorrhiza is an undifferentiated sheath.

Above the point where the scutellum is attached, the embryonal axis continues as the epicotyl. The epicotyl contains a shoot apex and a few leaf primordia. Enclosing these structures is a hollow foliar structure known as the coleoptile.

A typical dicotyledonous embryo, consists of an embryonal axis and two cotyledons. The portion of embryonal axis above the level of cotyledons is the epicotyl, which terminates with the plumule or stem tip. The cylindrical portion below the level of cotyledons is hypocotyl that terminates at its lower end in the radicle or root tip. The root tip is covered with a root cap.