Answer: Most epidermal cells are relatively flat, with their outer and side walls often being thicker than the inner wall.
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The waxy, water-resistant layer aids in protection against loss of water, mechanical injury, and invasion by parasitic fungi.
The epidermis might be thicker in some plants living in very dry habitats to provide better protection against water loss.
The outermost layer of cells in a plant is called the epidermis.
There is often no internal space inside sclerenchyma cells because the walls are so thickened with lignin.
Sclerenchyma is a type of permanent tissue that makes the plant hard and stiff, providing strength to the plant parts.
Sclerenchyma tissue can be found in stems, around vascular bundles, in the veins of leaves, and in the hard covering of seeds and nuts.
Collenchyma allows bending of various parts of a plant like tendrils and stems of climbers without breaking, and it also provides mechanical support.
Collenchyma provides flexibility in plants and is commonly found in leaf stalks below the epidermis.
Aerenchyma helps aquatic plants float by having large air cavities in the parenchyma.