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Collenchyma cells differ from parenchyma because their walls are
AReduced to almost no wall material at all
BThickened with lignin throughout the wall
CReplaced entirely by suberin in mature tissue
DThickened with cellulose at the corners
Answer & Solution
Correct answer: D. Thickened with cellulose at the corners
1. The chapter says parenchyma has uniformly thin cellulose walls.
2. Collenchyma also uses cellulose but with extra deposits at the corners.
3. These corner thickenings give flexible support to young stems.
4. So option A is correct.
_Source: Selina Concise Biology Class 9, Ch 3 Tissues, Plant and Animal Tissues (Mistral OCR'd PDF), section on collenchyma_
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