Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms, not by leaps

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Permanentt tissue

A) Simple Permanent Tissue

i) Parenchyma Cells

ii) Collenchyma Cells

iii) Sclerenchyma Cells

B) Complex permanent tissue

i) Xylem ( Hydrome)

ii) Phloem

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Parenchyma cells

Mature parenchyma cells have primary walls that are relatively thin and flexible, and most lack secondary walls

Mature parenchyma cells have a large central vacuole

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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.