#Id: 10685

#XL - R Botany

Secondary growth in monocotyledons

Due to lack of cambium in monocotyledons, secondary growth is absent. But Very few plants in monocots shows anomalous secondary growth such as Dracaena, Yucca, Aloe, Sansevieria and Agave

#Id: 10686

#XL - R Botany

Permanentt tissue

A) Simple Permanent Tissue

i) Parenchyma Cells

ii) Collenchyma Cells

iii) Sclerenchyma Cells

B) Complex permanent tissue

i) Xylem ( Hydrome)

ii) Phloem

#Id: 10687

#XL - R Botany

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

#Id: 10688

#XL - R Botany

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.

#Id: 10689

#XL - R Botany

Collenchyma cells

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

Collenchyma cells provide flexible support without restraining growth

#Id: 10690

#XL - R Botany

Sclerenchyma cells

Intercellular Space absen

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