TLS Online TPP Program

#Id: 9296

#XL - Q Biochemistry

TLS Online TPP Program

#Id: 9296

#XL - S Microbiology

TLS Online TPP Program

#Id: 10684

#XL - R Botany

Dicot stem anomalous secondary growth occurs due to following reasons:

Intraxylary phloem

Absence of vessels in the xylem

Scattered vascular bundles in dicot stem

Presence of medullary bundles

Presence of cortical bundles

Secondary growth in monocot

e.g., Dracaena 

TLS Online TPP Program

#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

TLS Online TPP Program

#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

TLS Online TPP Program

#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

TLS Online TPP Program

#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.

TLS Online TPP Program

#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