The broad midrib contains a vascular bundle, distinctly broader than that of stramonium, showing the usual bicollateral arrangement, which is also to be seen … The air spaces allow gaseous exchange: Vascular Bundles: Leaf vein made up of xylem and … The structure of a hydrophytic leaf differs from a mesophytic leaf due to selective pressures in the environment -- water is plentiful, … Key Concepts: Terms in this set (36) Tissue. Together with the palisade, the spongy layer makes up the mesophyll of the leaf. 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. How does the structure of the spongy mesophyll contribute to its function? The spongy mesophyll contains calcium oxalate, mainly in the form of single and twin prisms, but clusters and microsphenoidal crystals are also present (Fig. Spongy cells of the leaf are loosely packed together and lie between the palisade and the lower epidermis with the air spaces connected to each other and the outside by stomata. Lower epidermis. Plant issues - epidermis, palisade mesophyll and spongy mesophyll The structure of a leaf. Plant structures & their definition as described in CliffsNotes. The spongy layer is a tissue that also contains chloroplasts and other parenchyma cells, but the cells are less ordered and spread out, leaving large intracellular spaces. These cells are important constituents of various tissues in plants such as pith, cortex of roots and stems, as well as the mesophyll in the leaves. * Nafly Hussain * 2. A thin, waxy layer that covers the upper epidermis of the leaf, preventing the loss of water. This layer contains cells with chloroplasts and is a major site of photosynthesis. Tissues, Organs, Structure of a Leaf. 26.7B,D). Plant leaves are adapted for photosynthesis, and the exchange of gases required for the process. Hydrophytic Leaf Adaptations. It may be present in one, two, or three layers. Key Concepts: Terms in this set (10) Cuticle. A group of similar cells that perform the same function. The palisade parenchyma (also called the palisade mesophyll) aids in photosynthesis and has column-shaped, tightly-packed cells. It may be present in one, two, or three layers. The mesophyll of most leaves typically contains two arrangements of parenchyma cells: the palisade parenchyma and spongy parenchyma. Mesophyll 1. Organ. Hydrophytes (hydro- meaning water) are plants adapted to growing in water. They may either be present as an independent mass of tissue or be linked with other cells in different tissues. Mesophyll is the material that m akes up the majority of a plant's leaves. Loose tissue beneath the palisade layer of a leaf; has many air spaces between its cells. The palisade parenchyma (also called the palisade mesophyll) aids in photosynthesis and has column-shaped, tightly-packed cells. 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 mesophyll of most leaves typically contains two arrangements of parenchyma cells: the palisade parenchyma and spongy parenchyma. Chloroplast trap light energy: Spongy Mesophyll: Vary in shape, loosely fit together with many air spaces between them: Less chloroplast than palisade. ... spongy mesophyll. The spaces between cells create a larger … Parenchyma cells occur throughout the plant structure. 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