DENDROLOGY

Detailed explanation-1: -The developmental axis that bears the seedling leaves is the hypocotyl in the developing embryo (cotyledons). Upon germination, the hypocotyl forces the cotyledons to grow above the ground. It becomes part of the plant stem ultimately.

Detailed explanation-2: -A hypocotyl is a germinating seedling’s stem, normally found underneath the seed leaves but above the root. This leaf-like structure tends to grow in response to light stimulation. Because the hypocotyl is the main extension organ, it gradually develops into the stem as the plant continues to grow.

Detailed explanation-3: –To say in simple terms, hypocotyl is considered as a base stem which is present within the cotyledon, and shoots above the epicotyl.-It forms a hook during the hypogeal germination, and it generally ends as a radicle.

Detailed explanation-4: -Plumule is the part of a plant embryo formed at the time of germination. It develops into the shoot system and consists of the stem apex and first leaves.