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Describe the structure of T.S of dicot leaf.

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The T.S of dicot leaf contains 

(i) Epidermis – Upper and Lower 

(ii) Mesophyll 

(iii) Vascular bundles

(i) Epidermis : 

The leaf is dorsiventral it has upper and lower epidermis.

  • Upper Epidermis : Made up of single layer of tightly packed parenchyma cells. Cuticle is thicker than the lower epidermis.
  • Lower Epidermis : Made up of single layer of parenchymatous cells with thin cuticle. Stomata are more in Lower epidermis. Used for transpiration and gaseous exchange.

(ii) Mesophyll :

The region between upper and lower epidermis is called mesophyll. It is differentiated into palisade and spongy parenchyma.

  • Palisade parenchyma: Present below the upper epidermis cells are elongated. Cells do not have intercellular spaces. More number of chloroplast present. Function is photosynthesis.
  • Spongy parenchyma: Present above the lower epidermis. Cells are irregular shaped. Cells have intercellular spaces less number of chloroplast is present. Function is gaseous exchange.

(iii) Vascular bundles : Vascular bundles are conjoint, collateral and closed. Vascular bundles are surrounded by a compact layer of parenchymatous cells. These are called Bundle sheath. Xylem is present towards the upper epidermis. Phloem is present towards the lower epidermis.

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