STRUCTURE OF A DICOT SEED
EXAMPLE FRENCH BEAN
The seed contains a small plant, the embryo which consists of a young root or radicle and a young shoot or plumule. The embryo is attached to two leaves called the cotyledons, which are swollen with stored food. This stored food mainly consists of starch, which is used by the embryo for growth. The embryo and the cotyledons are enclosed in a tough seed coat or testa. The micropyle, the hole through which the pollen tube entered the ovule, remains as a hole in the testa and is an important route for the entry of water during germination. The hilum is the scar left where the seed was attached to the pod.