A radicle is the part of a seed that develops into the primary root during germination. It is the first structure to emerge from a seed, anchoring the plant and allowing it to absorb water and nutrients from the soil. The radicle grows downward, establishing the root system that supports the plant's growth. In flowering plants, the radicle is part of the embryo, which also includes the cotyledons and plumule. The cotyledons provide initial nourishment to the young plant until it can produce its own food through photosynthesis. Understanding the role of the radicle is essential in botany and agriculture.