Evolution by natural selection occurs if Genetic variation must leads by Ecotypes. Ecophene is not be selected by natural selection

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TLS Online TPP Program

#Id: 10693

#XL - R Botany

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

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Cortex ;

Consist of thin walled parenchymatous cells with intercellular spaces. Innermost layer of cortex is known as Endodermis

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Vascular bundles

Radial and Exarch

Center of monocot root is occupied by Parenchymatous cells called Pith

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Dicot stem

Epidermis ; 

Cutinized, bears multicellular hairs.

Cortex ;

It is differentiated into hypodermis, general cortex and endodermis.

Hypodermis is Collenchymatous

Pericycle ;

Above vascular bundle it is Sclerenchymatous

Vascular bundles ;

Conjoint, Collateral, Endarch and Open

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Monocot stem

Epidermis ; 

Consist of Parenchyma cells and covered with cuticle.

Hypodermis ;

Cells of Hypodermis are Sclerenchymatous

Vascular bundles ;

They lie Scattered in the Ground tissue.

Each Vascular Bundle is surrounded by 2 or 3 layered Sclerenchymatous sheath called as Bundle sheath.

Conjoint, Collateral, Closed and Endarch