Question 5
Which pair of statements is true of collenchyma?
The right answer is the one marked above.
Living cells, walls thickened with cellulose. Collenchyma keeps its cytoplasm, nucleus and central vacuole, and the thickening at the corners is cellulose, not lignin.
Lignin appears only in sclerenchyma and in the conducting cells of xylem — and wherever lignin coats the wall all round, the cell dies.