DENDROLOGY

Detailed explanation-1: -Complete answer: The hypocotyl is considered as the portion of the stem of an embryo plant under the stalk of the seed leaves or cotyledons and immediately above the base. The developmental axis that bears the seedling leaves is the hypocotyl in the developing embryo (cotyledons).

Detailed explanation-2: -The radicle is the first part of a seedling (a growing plant embryo) to emerge from the seed during the process of germination. The radicle is the embryonic root of the plant, and grows downward in the soil (the shoot emerges from the plumule).

Detailed explanation-3: -Hint: Epicotyl is the first part of the plant that emerge after the germination, where as it is important in the beginning stage of the plant life, whereas hypocotyl is the structure that can be observed in the seedling after the germination.