$α$ -cellulose fibrous thickening is present in:

Epidermis

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Tapetum

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Outer tangential wall of endothecium

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Radial wall of endothecium

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Solution

The correct option is D Radial wall of endothecium
Endothecium is present below the epidermis and is made up of radially elongated cells. Some cells of endothecium develop fibrous thickening of $α$ - cellulose from their radial walls.
Tapetum is the nutritive tissues covering the anther.

Suggest Corrections

Collenchyma	Parenchyma
$(1)$ Mechanical tissue	Living tissue
$(2)$ Absent in monocots	Present in monocots
$(3)$ Intercellular spaces absent	Intercellular spaces may be present
$(4)$ Has thickenings of cellulose and lignin	Has thickening of cellulose and hemicellulose