Cotyledon
Cotyledon explained in an easy to understand way:
Imagine you're packing for a trip and trying to fit everything you need into a small suitcase. Just like how you carefully organize the essential items in your suitcase to make sure you have everything ready for your journey, a seed packs all the necessary nutrients and initial growth materials in its embryo, including the cotyledon, to ensure the plant has a successful start. The suitcase is like the seed, and the essential items you pack are akin to the cotyledon, which acts as both a food source and a starting point for the young plant, ensuring it has what it needs to grow and thrive once it "unpacks" in the soil.
Practice Version
Cotyledon: The seed leaf inside the embryo of a seed. Cotyledon. A cotyledon is the first leaf or pair of leaves produced by the embryo of a seed plant, which helps in the initial stages of growth.