Epigeal germination is a type of seed germination that occurs when the cotyledons of the seedling are brought above the ground level. This process is also known as hypogeal germination.
Among the options provided, groundnut is an example of a plant that exhibits epigeal germination. During the germination process, the hypocotyl of the groundnut seed elongates and pushes the cotyledons above the ground, while the epicotyl remains below. This brings the cotyledons above the soil level, where they can photosynthesize and provide energy for the seedling to grow.
Sorghum, maize, and millet, on the other hand, exhibit hypogeal germination, in which the cotyledons remain below the soil surface.