Question:

Name the regions in which parenchyma tissue is present.

Updated On: Nov 21, 2023
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Solution and Explanation

Parenchyma tissue is a type of simple plant tissue composed of relatively unspecialized cells. It is widespread in various regions of plants and serves several functions. Parenchyma tissue can be found in the following regions:

  1. Ground Tissue: Parenchyma is a significant component of ground tissue, which forms the fundamental bulk of non-woody plant structures such as leaves, stems, and roots. In this context, parenchyma cells function in photosynthesis, storage of nutrients, and support.
  2. Cortex: The cortex of stems and roots often contains parenchyma cells. These cells can store food, provide structural support, and participate in various metabolic activities.
  3. Pith: In the center of many stems, particularly in dicotyledonous plants, there is a tissue called pith. Parenchyma cells are commonly found in the pith, where they can store and transport nutrients.
  4. Mesophyll: In leaves, parenchyma cells make up the mesophyll tissue. Mesophyll parenchyma cells are involved in photosynthesis, playing a crucial role in the production of food for the plant.
  5. Parenchyma in Tissues Surrounding Vascular Bundles: Parenchyma cells are often present around vascular bundles in stems and roots, providing support and participating in storage and other functions.
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Concepts Used:

The Tissue System

Epidermal Tissue System:

The epidermal tissue system forms the outer-most covering of the whole plant body and comprises epidermal cells, stomata, and the epidermal appendages – the trichomes and hairs. The epidermis is the outermost layer of the primary plant body. It is made up of elongated, compactly arranged cells, which form a continuous layer. The epidermis is usually single-layered.

Ground Tissue System:

All tissues except the epidermis and vascular bundles constitute the ground tissue. It consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma. Parenchymatous cells are usually present in the cortex, pericycle, pith, and medullary rays, in the primary stems and roots. In leaves, the ground tissue consists of thin-walled chloroplast-containing cells and is called mesophyll.

Vascular Tissue System:

The vascular system consists of complex tissues, the phloem, and the xylem. The xylem and phloem together constitute vascular bundles. In dicotyledonous stems, cambium is present between phloem and xylem. Such vascular bundles because of the presence of cambium possess the ability to form secondary xylem and phloem tissues and hence are called open vascular bundles. In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.

Read More: Plant Tissue