Q.
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a
Primary cell wall is chiefly composed of a soluble fibrous polysaccharide called suberin.
b
Secondary cell wall is mainly composed of lignin and is deposited on the outer surface of primary wall.
c
Pits are present in primary walls whereas they are absent in secondary walls.
d
The primary cell walls of adjacent cells are cemented through middle lamella which is composed of calcium pectate.
answer is D.
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