Secondary wall is not formed in

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(D) The secondary cell wall is a thick layer formed inside the primary cell wall in certain plant cells,such as tracheids,vessels,and sclerenchyma,to

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All the above

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(D) The secondary cell wall is a thick layer formed inside the primary cell wall in certain plant cells,such as tracheids,vessels,and sclerenchyma,to provide structural support.$Parenchyma$ cells have thin primary walls and lack secondary walls.$Collenchyma$ cells possess unevenly thickened primary walls (due to cellulose,hemicellulose,and pectin) but do not develop a secondary wall.$Companion$ cells are specialized parenchyma cells associated with sieve tube elements and also possess only primary cell walls.Therefore,none of these cell types form a secondary wall.

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