Outline three differences between the structures of dicotyledonous and monocotyledonous plants. Teachers should emphasize three differences between monocotyledonous and dicotyledonous plants (examples include: parallel versus net-like venation in leaves, distribution of vascular tissue in stems, number of cotyledons, floral organs in multiples of 3 in monocotyledonous versus 4 or 5 in dicotyledonous, fibrous adventitious roots in monocotyledonous versus tap root with lateral branches in dicotyledonous).