The important functions of the spongy mesophyll are:
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The presence of chloroplast in the spongy mesophyll tissue also helps in performing the photosynthesis.
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In xerophytic plants these cells stores water and food in the soluble forms.
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In Nymphaea plant sclereids which give mechanical support to the spongy tissue and secretory cells are also found in these cells.
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In aquatic plants the spongy mesophyll cells have aerenchyma which provides buoyancy to the leaves.