Plants that lack organs like root, stem, leaf, flower, and fruit are called simple plants. e.g algae, mosses and ferns.
A vascular plant is a plant with roots and is very different from a nonvascular plant. An example of a vascular plant is a Fern. An example of a nonvascular plant is moss.They are different because a Fern contains vascular tissue that contains cells that store food, water, etc, and a nonvascular plant does not. A vascular plant is also a plant that has a flower at the tip of a stem that is part of the plant.