Class II MHC glycoproteins expressed predominantly on pAPCs, where they primarily present exogenous antigenic peptides to CD4+ T cells.

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#Id: 10698

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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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#Id: 10700

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Monocot leaf (Isobilateral leaf) 

Epidermis ;

Consists of upper and lower epidermis.

Both the layers are cutinized.

In some grasses they are large with thin, flexible walled cells called as Motor or Bulliform cells

Mesophyll ;

Not differentiated into palisade and spongy.

Made of parenchyma cells which have Chloroplasts.

Vasular bundle

Arranged in parallel manner.

Conjoint, Collateral and Closed and enclosed by a bundle sheath Xylem (adaxial) and Phloem (abaxial)

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#Id: 10701

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The  stele  is  the  central  part  of  the root  or  stem  containing  the  tissues  derived  from  the  Procambium.  These  include  vascular  tissue.

The  main  function  of  the  stele  is  to  provide structural  support  to  the  plant.

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