The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis. Essentially, mesophyll cells are highly differentiated cells that make up the mesophyll layer found in plant leaves. Leaves, of course, have a huge surface area, and the irregular-shaped, loosely-packed spongy cells increase the area for gas exchange still further. In terms of arrangement, mature parenchyma cells are generally arranged with little intercellular spaces between them. Spongy Mesophyll: this tissue contains large air spaces which are linked to the atmosphere outside the leaf through microscopic pores called stomata on the lower surface. Vascular bundles: These are present at regular intervals. The mesophyll has two layers: an upper palisade layer and a lower spongy layer. Name the cells that are either side of the stomata. Gases dissolve in this water as they move into and out of the cells. The palisade parenchyma contains cells with a high number of chloroplasts, which are necessary to the process of photosynthesis. The mesophyll has two layers: an upper palisade layer and a lower spongy layer. Together with the palisade, the spongy layer makes up the mesophyll of the leaf. A waxy cuticle covers all aerial surfaces of land plants to minimize water loss. These two … Mesophyll cells are found in the plant's leaves. How is palisade mesophyll tissue adapted for its function. Read about our approach to external linking. Hydrophytic Leaf Adaptations. The spongy mesophyll are usually ball-shaped with large intercellular spaces, but usually contains f fewer chloroplasts than the palisade cells. III. Suggest the functions of each layer using knowledge of photosynthesis; Set up stomata prac - nail varnish on leaf; View stomata under the microscope ; Plenary; 6 mark question on the structure of the leaf - come up with a mark scheme as a class and peer/self mark; Palisade mesophyll Spongy mesophyll Stomata Guard cells Practical - Locating stomata and guard cells. These cells possess large concentration of chloroplast. The palisade layer is found below the upper epidermis. The numerous small bumps in the palisade parenchyma cells are chloroplasts. To enter the leaf, gases diffuse through small pores called stomata. Explain how the structure of the leaf is adapted to its role in photosynthesis. Mitosis and cell specialisation - OCR Gateway, The challenges of size in animals - OCR Gateway, The challenges of size in plants - OCR Gateway, Home Economics: Food and Nutrition (CCEA). These leaf layers are clearly visible in the (b) scanning electron micrograph. How is the upper epidermis adapted to its function? Describe how the xylem is adapted for its function. The structure of the tissues is related to their functions in the plant. Stomata on the leaf underside allow gas exchange. The important functions of the spongy mesophyll are: The presence of chloroplast in the spongy mesophyll tissue also helps in performing the photosynthesis. The structure of the tissues is related to their functions in the plant. … The spongy mesophyll cells are covered by a thin layer of water. The mesophyll is composed of elongated cells called PLASIADE PARENCHYMA and irregularly arranged cells with large intercellular spaces known as SPONGY PARECHYMA. Answer: E 24 24) Water is most likely to enter a mesophyll cell A) as a gas. These cells are not neatly packed into rows like the palisade cells. Plant issues - epidermis, palisade mesophyll and spongy mesophyll. B) absorb ions. A leaf cell, by definition, is any cell found within a leaf.However, there are many different kinds of leaf cell, and each plays an integral role in the overall function of the leaf and the plant itself. The Internal Structure of a Leaf Diagram below is a cross section of a dicotyledonous leaf that shows all the different tissues that make up the leaf. Spongy tissue is a type of tissue found both in plants and animals. The spongy mesophyll cells are covered by a thin layer of water. The mesophyll has two layers: an upper palisade layer comprised of tightly packed, columnar cells, and a lower spongy layer, comprised of loosely packed, irregularly shaped cells. Cells in the spongy layer usually contain few chloroplasts (especially in dicot plants) and are the storage place for … And transport materials to and from the sun into sugars which fuel the … mesophyll... Pushes chloroplasts to the spongy mesophyll cells also contain chloroplasts and facilitates the passage gases. 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