The parenchyma cells in plants are:
living and loosely arranged with intercellular spaces
Parenchyma is the most basic and abundant simple permanent tissue in plants. Its cells are living, thin-walled and loosely packed, leaving large intercellular spaces between them.
These spaces help in gaseous exchange and storage, and parenchyma also performs photosynthesis (chlorenchyma) and buoyancy (aerenchyma).
"Dead and elongated with lignified walls" describes sclerenchyma, not parenchyma.
"Living and thickened at corners without spaces" describes collenchyma, which provides mechanical support.
Hence, parenchyma cells are living and loosely arranged with intercellular spaces.
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