Answer:
Vascular plants have three types of tissue: dermal, ground, and vascular.
Flowering plants, also known as angiosperms, are vascular plants—meaning they have a transportation system that allows water, minerals, and food to move throughout the plant. They are composed of three types of tissue: dermal tissue, vascular tissue, and ground tissue.
Dermal tissue, vascular tissue, and ground tissue in a dicot root.
Dermal tissue is the “skin” of the plant, protecting it from damage. Most leaves, as well as some roots and stems, have a waxy layer called the cuticle that covers the dermal tissue. The cuticle helps the plant retain water, protects the plant against UV rays, and prevents pathogens from entering the plant.
Vascular tissue—like veins and arteries in the human body—moves water, nutrients, and food through all the parts of the plant. There are two main types of vascular tissue in plants: the xylem and phloem. The xylem carries water and dissolved minerals upward—from the root, through the stem, to the leaves. The phloem carries dissolved sugars and organic compounds, made by the cells in the leaves, downward to supply the plant’s stem and root. Together, the xylem and phloem form vascular bundles throughout the plant’s interior.
Ground tissue makes up most of the plant’s interior. It provides structural support and contains cells that carry out key functions such as photosynthesis, gas exchange, respiration, and the storage of water and starch. There are three types of ground tissue cells: parenchyma, collenchyma, and sclerenchyma.
2. Most flowering plants can be classified as monocots or dicots.
Monocots and dicots are the two major types of flowering plants. Did you notice the prefixes in monocot and dicot? These refer to how many cotyledons the plant’s seed contains. Cotyledons are structures that provide energy and nutrients to the young plant. Monocots have one cotyledon, and dicots have two.
Monocots and dicots differ in several other major ways, as well. For example, monocots (ex. lilies) have flower parts that appear in groups of three, and dicots (ex. pansies) have flower parts in groups of four or five. In addition, monocots are monosulcate, meaning that their pollen grains have one furrow or groove, whereas dicots are trisulcate, meaning that their pollen grains typically have three furrows or grooves.
Further differences between monocots and dicots can be seen in the structure of their three main parts: the roots, stems, and leaves.