Selfish (cheater) genotypes are expected to increase within populations, a trait that benefits the group would have to evolve by selection among groups, rather than by selection among individual organisms within the groups.

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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 

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Dicot leaf (dorsiventral leaf) 

Epidermis ;

The upper and  lower surfaces are covered by the epidermis.

Cells of epidermis are  Parenchymatous.

Stomata restricted to lower surface (HYPOSTOMATIC) 

Outer walls thickened and cutinized.

Mesophyll ;

Palisade (upper)

Spongy (lower)

Vascular tissue ;

Conjoint, Collateral and Closed surrounded by Bundle sheath

Xylem (Adaxial) and Phloem (Abaxial)

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