Explain how you would tell if something that looks like a leaf (flat and green plant part) is infact, developmentally, a leaf. Thanks! Solution A flat borad green plant part can be called as leaf if 1: it is present laterally to the shoot apex. 2: it is developed as determinate outgrowth of the shoot apex. 3: An axillary bud is located in the axil of the green flat plant part. 4: Successive leaves follow a particular pattern of arrangement i.e. they are developed in phyllotaxy. 5: Two most common visible structural parts of leaves as lamina and petiole. The lamina is the broad flat part of the leaf that has veins..