This cell type has thick primary walls, maintains the ability to differentiate, and often helps strengthen herbaceous stems. 23:48 Biology This cell type has thick primary walls, maintains the ability to differentiate, and often helps strengthen herbaceous stems.a. Parenchymab. Collenchymac. Xylemd. Sclerenchymae. PhloemAnswer: b. Collenchyma Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+