1. The spongy mesophyll is found towards the lower epidermis. The mesophyll of most leaves typically contains two arrangements of parenchyma cells: the palisade parenchyma and spongy parenchyma. 26.7B,D). Palisade mesophyll. The spongy mesophyll is located on the bottom/underside of plant leaves, so it has less chloroplasts and aren't as rigid as the tough mesophyll. Palisade Mesophyll: Long with many chloroplasts: Main region for photosynthesis. Spongy mesophyll. The air spaces allow gaseous exchange: Vascular Bundles: Leaf vein made up of xylem and phloem vessels spongy mesophyll In a leaf, mesophyll tissue comprising cells of irregular shape, some of them lobed, separated by large spaces in which the atmosphere is humid. Chloroplast trap light energy: Spongy Mesophyll: Vary in shape, loosely fit together with many air spaces between them: Less chloroplast than palisade. It may be present in one, two, or three layers. The palisade parenchyma (also called the palisade mesophyll) aids in photosynthesis and has column-shaped, tightly-packed cells. Cells compactly arranged at right angle to the epidermis. These cells possess large concentration of … 2. Overview of Spongy Mesophyll The leaf is a vital organ of the plant where most of the functions related to the plant metabolism take place. Since the mesophyll cells contain chloroplasts the tissue is also referred to as chlorenchyma . The mesophyll layer is divided into palisade and spongy layers. It lies just below the palisade layer. BioCoach Activity Concept 5: Structure of a Mesophyll Cell. 2. The spongy mesophyll is located on the bottom/underside of plant leaves, so it has less chloroplasts and aren't as rigid as the tough mesophyll. The broad midrib contains a vascular bundle, distinctly broader than that of stramonium, showing the usual bicollateral arrangement, which is also to be seen in the stems. There is a system of air spaces which communicate with the air chambers behind the stomata. Functions of the Mesophyll Cells are with large inter cellular space. So, this is the key difference between palisade parenchyma and spongy parenchyma. Because of this, they have air spaces in between them, which is where the stomata and guard cells reside. In contrast, spongy parenchyma is the lower mesophyll layer of spherical or ovoid cells with few chloroplasts and very prominent intercellular air spaces. The palisade layer is found below the upper epidermis. 1. 3. In brief, the spongy parenchyma [also called spongy mesophyll] has many spaces between cells to facilitate the exchange of gases (CO2 and O2) needed for respiration and photosynthesis. Spongy mesophyll is the site of gaseous exchange for photosynthesis and respiration.See also PALISADE MESOPHYLL. These cells in the middle of the leaf contain many chloroplasts, the organelles that perform photosynthesis. 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