Green House Management Practice Test

During seed germination, the first structure to appear is the radicle, the embryonic root. When a seed takes up water, enzymes activate and stored nutrients are mobilized to fuel growth. The radicle breaks through the seed coat and grows downward to anchor the seed and begin absorbing water and minerals. This initial root formation happens before the shoot begins to emerge, because establishing a water-taking, anchored base is essential before the above-ground parts develop. The shoot primordium (plumule) and the stem segment (hypocotyl) along with the cotyledons come later, and their appearance can vary depending on whether the seed undergoes epigeal or hypogeal germination, but they follow after the radicle has established.