Question

Stele consists of
A. Phloem
B. Xylem
C. Pericycle
D. All of the above

Answer 1

Hint: A root is one of the important parts of a plant that is developed under the ground and helps anchor the plant firmly in the soil. It mainly absorbs water and minerals from the soil and passes them to the different parts of the plant.

Complete answer:
The root is an important part of the plant which is present under the ground and forms the underground system of the plants. The main function of the roots is to absorb water and different types of minerals which are essential for the plant and transport them to the different parts of the plants such as leaves and stem with a specific mechanism. Another important function of the root is mooring the plant firmly in the ground. There are different parts found in a root.
In the case of a vascular plant, the stele can be defined as the central part of the root or stem which contains the tissues that are derived from the procambium. The term stele has been evolved from a Greek word that means pillar. The stele theory was pointed for the first time by van Tieghem from the point of view of the phylogeny.
The stele consists of vascular tissue, ground tissue or pith, and a pericycle. The pericycle mainly forms the outermost boundary of the stele. Therefore, the stele can be explained as the vascular bundle. The stele is composed of mainly three tissues which are the pericycle, the xylem, and the phloem. In the outer side of the stele, there is the endodermis present, which is the innermost cell layer of the cortex. Other than the stele, the primary structure of root and stem consists of the cortex which is the major part of the root.
There are different types of stele which exist which are Protostele, Siphonostele, Solenostele, Dictyostele, Polycyclic Stele, and Eustele.
Thus, the right option is D.

Note: A root is an important part of a plant. It is grown under the ground and absorbs the water and different types of minerals. There are two parts found in the root, which are the cortex and stele. In the vascular plant, the stele is the central part of the root. It consists of vascular tissue, pith, and a pericycle. In this vascular bundle, mainly three tissues are present which are the pericycle, the xylem, and the phloem.