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Spongy tissue is a type of tissue found both in plants and animals. In plants, it is part of the mesophyll , where it forms a layer next to the palisade cells in the leaf . The spongy mesophyll's function is to allow for the interchange of gases (CO 2 ) that are needed for photosynthesis .
Parenchyma cells have a variety of functions: In leaves, they form two layers of mesophyll cells immediately beneath the epidermis of the leaf, that are responsible for photosynthesis and the exchange of gases. [2] These layers are called the palisade parenchyma and spongy mesophyll. Palisade parenchyma cells can be either cuboidal or elongated.
Aerenchyma in stem cross section of a typical wetland plant. Aerenchyma or aeriferous parenchyma [1] or lacunae, is a modification of the parenchyma to form a spongy tissue that creates spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root. [2]
Diagram of the internal structure of a leaf. Palisade cell, or palisade mesophyll cell are plant cells located inside the mesophyll of most green leaves.They are vertically elongated and are stacked side by side, in contrast to the irregular and loosely arranged spongy mesophyll cells beneath them.
Examples include flattened plant stems called phylloclades and cladodes, and flattened leaf stems called phyllodes which differ from leaves both in their structure and origin. [3] [7] Some structures of non-vascular plants look and function much like leaves. Examples include the phyllids of mosses and liverworts.
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Parenchyma (/ p ə ˈ r ɛ ŋ k ɪ m ə /) [1] [2] is the bulk of functional substance in an animal organ or structure such as a tumour. In zoology, it is the tissue that fills the interior of flatworms. In botany, it is some layers in the cross-section of the leaf. [3]
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