Asked Dec 19, 2019
Leaf Cross Section Know structures and functions

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Leaf Cross Section Know structures and functions A- GH


Expert Answer

Step 1

The parts of the cross sectioned leaf are as follows:

  1. Cuticle
  2. Palisade mesophyll
  3. Spongy mesophyll
  4. Guard cell
  5. Lower epidermis
  6. Upper epidermis
  7. Stoma
  8. Phloem
  9. Xylem

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A- B- D. GH

Step 2

Function of cuticle:

The primary function of cuticle is reducing the rate of water loss from the surface of the leaf. It acts as a barrier and prevents the evaporation of water from the upper surface. It also prevents contamination of plant tissues by restricting the entry of dirt, external water and micro-organisms into the tissues. It also functions as a defence barrier restricting the penetration of viral particles, bacterial cells and spores into the plant tissues.

Function of palisade mesophyll:

The mesophyll layer is composed of two types of cells. One of them is palisade mesophyll which is located between the upper and lower epidermis. This plays a crucial role in the process of photosynthesis. As they are cylindrical and elongated, they contain many chloroplasts (about 70% of cell chloroplasts) and the cells are arranged in a complex manner and this complexity contributes to their activity. ...

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