III. Underground Stem modification

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Parenchyma cells

Most parenchyma cells retain the ability to divide and differentiate into other types of plant cells under particular conditions—during wound repair, 

for example, It is even possible to grow an entire plant from a single parenchyma cell.

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Collenchyma cells

Collenchyma cells are generally elongated cells that have thicker primary walls than parenchyma cells,

Collenchyma cells provide flexible support without restraining growth

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Sclerenchyma cells

Intercellular Space absen

The secondary cell wall, produced after cell elongation has ceased, is thick and contains large amounts of lignin

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Xylem, Phloem and cambium form the major part of the vascular bundle found in stelar part.

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Epidermis ;

Consist of single layered, tightly placed, thin walled, uncutinised cells called as Epiblema or Rhizodermis.

Epiblema in younger roots bears Unicellular root hairs and is also called Pilliferous layer