Since the mesophyll cells contain chloroplasts the tissue is also referred to as chlorenchyma . Mesophyll cells are specialized for photosynthesis. 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. Functions of the Mesophyll It may be present in one, two, or three layers. Spongy mesophyll. The air spaces allow gaseous exchange: Vascular Bundles: Leaf vein made up of xylem and phloem vessels These cells in the middle of the leaf contain many chloroplasts, the organelles that perform photosynthesis. 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. BioCoach Activity Concept 5: Structure of a Mesophyll Cell. 2. There is a system of air spaces which communicate with the air chambers behind the stomata. It lies just below the palisade layer. The palisade mesophyll, bundle sheath and spongy mesophyll are known as the ground parenchyma. The palisade parenchyma (also called the palisade mesophyll) aids in photosynthesis and has column-shaped, tightly-packed cells. The mesophyll layer is divided into palisade and spongy layers. The spongy mesophyll is found towards the lower epidermis. The palisade layer is found below the upper epidermis. 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. Palisade Mesophyll: Long with many chloroplasts: Main region for photosynthesis. 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. Cells are with large inter cellular space. Spongy mesophyll cells are a type of parenchyma cells which is a part of the mesophyll tissue or ground tissue present below the epidermis of leaves in plants. 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. 1. These cells possess large concentration of … Chloroplast trap light energy: Spongy Mesophyll: Vary in shape, loosely fit together with many air spaces between them: Less chloroplast than palisade. Cells compactly arranged at right angle to the epidermis. So, this is the key difference between palisade parenchyma and spongy parenchyma. Palisade mesophyll. Spongy mesophyll is the site of gaseous exchange for photosynthesis and respiration.See also PALISADE MESOPHYLL. The mesophyll of most leaves typically contains two arrangements of parenchyma cells: the palisade parenchyma and spongy parenchyma. 1. 26.7B,D). 2. 3. 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