The cotyledon in the seed of grass family is called:

Scutellum

The correct answer is Option (4) → 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.