Question #d2aa0

1 Answer
Dec 2, 2017

See below.


A typical leaf contains epidermis made of cuticle, mesophyll cells[parenchymatous tissue with chloroplast perform photosynthesis}, stomatal apparatus{guard cell and subsidiary cell}, bundle sheath with vascular tissue{xylem,phloem}, bulliform cells in monocots etc.

The leaf cross section of monocot and dicot leaves are different.


  • Present at right angle to the stem.
  • the upper surface of the leaf receives more sunlight{so difference in internal structure- differentiation of mesophyll}
  • seen in dicots
  • the cuticle is seen on both surface [more thick in upper}
  • stomata are present more on lower

  • mesophyll cell is differentiated into upper palisade parenchyma [very closely packed without intercellular spaces
    cylindrical elingated/blue} and lower spongy parenchyma {spongy tissue-arranged loosely with intercellular spaces/shown circular and green}-

  • Parenchymatous bundle sheath extensions.

 my old notebook


  • Arranged parallel to stem
  • Both surface of the leaf receive equal amount of sunlight [so no difference in internal structure of leaf}

  • seen in monocots

  • equal thickness of cuticle

  • mesophyll cells not differentiated

  • the upper epidermis has a few large colorless thin-walled cells called --BULLIFORM Cells [help in rolling and unrolling of leaf}

  • sclerenchymatous bundle sheath extensions