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  1. 1. * Nafly Hussain *
  2. 2.   Mesophyll is the material that m akes up the majority of a plant's leaves. It is a relatively simple organic compound Extremely important and is chiefly responsible for making plant life as we know it possible. * Nafly Hussain *
  3. 3. SECTION OF A LEAF * Nafly Hussain *
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  6. 6. <ul><li>Mesophyll comprises the majority of the interior of a leaf. </li></ul><ul><li>The exterior &quot;skin&quot; of the leaf is called the epidermis and is </li></ul><ul><li>responsible for protecting the leaf from physical damage and </li></ul><ul><li>from excessive moisture loss. </li></ul><ul><li>The majority of the material found within the epidermis, with </li></ul><ul><li>the exception of the leaf veins, is mesophyll. </li></ul><ul><li>Indeed, anything in the leaf that is not vein or epidermis falls </li></ul><ul><li>under the category of mesophyll. There are, however, certain </li></ul><ul><li>sub-categorizations. </li></ul>IDENTIFICATION * Nafly Hussain *
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  9. 9. <ul><li>Mesophyll has several different important functions within a </li></ul><ul><li>leaf's basic structure. </li></ul><ul><li>First of all, it is the area of the leaf in which the majority of </li></ul><ul><li>photosynthesis takes place. </li></ul><ul><li>It is also where the plant absorbs the majority of its necessary </li></ul><ul><li>carbon dioxide, which has been let through the epidermis but is </li></ul><ul><li>not actually absorbed there in great quantity. </li></ul><ul><li>A plant's mesophyll is also responsible for storing energy and </li></ul><ul><li>nutrients until they can be transmitted to the veins in the leaf </li></ul><ul><li>and sent elsewhere in the plant where they are needed. </li></ul>* Nafly Hussain *
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  12. 12. <ul><li>The significance of mesophyll cannot be easily overstated. </li></ul><ul><li>Because mesophyll is responsible for photosynthesis to take </li></ul><ul><li>place in large plants on any appreciable scale. </li></ul><ul><li>It can be fairly stated that it is the key to plant life on Earth. </li></ul><ul><li>Without photosynthesis human beings and all other forms of </li></ul><ul><li>life as we know it could simply not exist. </li></ul><ul><li>That is just how important mesophyll is. Without it life on </li></ul><ul><li>Earth would be a completely different, unimaginable thing. </li></ul>* Nafly Hussain *
  13. 13. <ul><li>In colder climates with less sun exposure the exact opposite happens, and the leaves develop only one thin palisade layer of mesophyll and more spongy mesophyll within the interior of the leaves. </li></ul>The exact manner in which any given plant's mesophyll functions is somewhat dependent on physical geography, more particularly on climate . <ul><li>In climates of extreme heat and sun exposure, most plants develop leaves </li></ul><ul><li>that have multiple palisade layers of mesophyll and less spongy mesophyll. </li></ul><ul><li>This is to maximize the photosynthesis capabilities of the plant and to </li></ul><ul><li>insulate the interior spongy layer from excessive ultraviolet radiation. </li></ul>* Nafly Hussain *
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  16. 16. <ul><li>Palisade cells are grouped together to give the palisade layer. </li></ul><ul><li>Their cylindrical shape , which allows maximum absorption of </li></ul><ul><li>light by chloroplasts. </li></ul><ul><li>These cells produce carbohydrates in greater quantities. </li></ul><ul><li>The palisade mesophyll contains the largest number of </li></ul><ul><li>chloroplasts per cell. </li></ul><ul><li>Palisade cells are placed all over the top of a leaf, maximizing the </li></ul><ul><li>extent of light absorption. As a result, the top of a leaf is often </li></ul><ul><li>darker than the bottom. </li></ul>* Nafly Hussain * PALISADE CELLS SHOW VARIOUS ADAPTATIONS:
  17. 17. <ul><li>Chloroplasts are especially concentrated in the palisade </li></ul><ul><li>mesophyll and it is in these cells that much of the </li></ul><ul><li>photosynthesis in a tree takes place. </li></ul><ul><li>Light absorption and photosynthesis is carried out by the </li></ul><ul><li>chlorophyll, and it is these that give leaves a green pigment. </li></ul><ul><li>The cell wall helps the cell keep its shape, and the membrane </li></ul><ul><li>lets certain substances in and out while being permeable to </li></ul><ul><li>water. </li></ul><ul><li>The palisade cells also stores glucose as starch a storing sugar. </li></ul>* Nafly Hussain *
  19. 19. Continue… * Nafly Hussain *
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  23. 23. <ul><li>Packed cylindrical cells </li></ul><ul><li>Numerous chloroplasts </li></ul><ul><li>No transport tissues present </li></ul><ul><li>(eg .xylem and phloem) </li></ul><ul><li>No large intercellular spaces </li></ul><ul><li>Has no thin layer of moisture </li></ul><ul><li>for carbon dioxide to dissolve </li></ul><ul><li>in </li></ul><ul><li>Irregular in shape </li></ul><ul><li>Very little chloroplasts present </li></ul><ul><li>Transport tissues are present </li></ul><ul><li>Large intercellular air spaces </li></ul><ul><li>present </li></ul><ul><li>Has a thin film of moisture for </li></ul><ul><li>carbon dioxide to dissolve in it </li></ul>PALISADE CELLS SPONGY CELLS * Nafly Hussain *
  24. 24. GROUP 8 - KARNESHI - KOWSIKAN - SACHITHRA R * Nafly Hussain *