Question

Stele is made up of in plant

• A. Pericycle
• B. Vascular Tissue
• C. Pith
• D. All

Hint:

Remember the three main regions of a plant stem or root: the epidermis (outermost protective layer), the cortex (ground tissue beneath the epidermis), and the stele (the central vascular cylinder). The stele comprises the vascular bundles (xylem and phloem), pericycle, and often a central pith.

Answer 1

The Correct Option is D

Step 1: Understand the definition of Stele
The stele is the central part of the root or stem of a vascular plant. It consists of vascular tissue (xylem and phloem), along with associated supporting tissues. The structure of the stele varies among different plant groups and organs. Step 2: Identify the components that form the Stele
The primary components of the stele are:
Vascular tissue: This includes the xylem and phloem, which are responsible for the transport of water, minerals, and sugars throughout the plant.
Pith: This is the central core of the stem or root, composed of parenchyma cells, especially prominent in dicot stems and monocot roots. It functions primarily in storage.
Pericycle: This is a layer of parenchymatous or sclerenchymatous cells located just inside the endodermis and surrounding the vascular tissue. It plays a crucial role in the formation of lateral roots and contributes to secondary growth in some plants. Step 3: Analyze each option (A) Pericycle
The pericycle is indeed a component of the stele, forming the outermost layer of the stele, just internal to the endodermis. (B) Vascular Tissue
Vascular tissue (xylem and phloem) is the defining and central component of the stele, responsible for conduction. (C) Pith
Pith is present in the center of the stele in many stems and roots, providing storage and structural support. (D) All
Since pericycle, vascular tissue (xylem and phloem), and pith are all integral parts of the stele in various plant structures (though not all components are present in every type of stele or every plant organ, such as pith might be absent in dicot roots, the question asks generally about "plant"), "All" represents the comprehensive composition when considering different plant types and organs. For instance, in a dicot stem, all three are present. Step 4: Conclusion
The stele is a complex central cylinder that includes the vascular tissues, pericycle, and often pith. Therefore, all the listed components contribute to the structure of the stele in plants. The correct answer is: $$(D) All$$