Question:

Stele includes

Updated On: Sep 12, 2022
  • pericycle
  • vascular bundles
  • pith
  • all of these
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The Correct Option is D

Solution and Explanation

Stele is the fundamental part of the shoot in vascular plants. It mainly consists of tissues derived from procambium. These tissues includes vascular tissue, pith and pericycle. The pericycle forms the outermost boundary of the stele. The word 'stele' is taken from Greek language, which means 'pillar'. In plants, stele is the primary vascular system of plant's stem. 

The stele is mainly categorized into two types:

  • Protostele - It is characterized by an interior core of xylem surrounded by phloem. 
  • Siphonostele - In this type, there is a central pith (parenchyma) surrounded by vascular tissues. 
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Top Questions on Anatomy of Dicotyledonous and Monocotyledonous Plants

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Notes on Anatomy of Dicotyledonous and Monocotyledonous Plants

Concepts Used:

Anatomy of Dicotyledonous and Monocotyledonous Plants

Dicot Root:

  • Dicot plants have the taproot system.
  • The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
  • The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
  • The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
  • Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
  • In dicots, the central pith is not distinct.
  • There are two to four xylem and phloem.
  • The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.

Monocot Root:

Monocot roots do not show much difference in the anatomy from that of the dicot roots.

  • Monocot plants possess an adventitious root system.
  • As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
  • Pith is conspicuous and large.
  • The number of xylem in a monocot is six or more.
  • Secondary growth is not seen in the monocot plants.