Discussion
Periderm is a protective tissue found in stems and roots of gymnosperm and woody dicotyledons. It contributes to the increased thickness by secondary growth. Match the peridermal components given in Group I with the cell/tissue types given in Group II.
| Group I | Group II |
|---|---|
| (P) Phelloids | (1) Tissue resembling cortical parenchyma |
| (Q) Phellogen | (2) Cork cambium |
| (R) Phellem | (3) Cork-like cells |
| (S) Phelloderm | (4) Cork |
Answer: B
The match is P-3; Q-2; R-4; S-1.
- Phelloids are cells within the phellem that resemble cork cells but lack suberised walls: cork-like cells.
- Phellogen is the cork cambium, the lateral meristem that produces the periderm.
- Phellem, produced to the outside by the phellogen, is the cork.
- Phelloderm, produced to the inside, is living tissue that resembles cortical parenchyma.
The other options interchange phellogen and phelloids or call the phelloderm cork, mixing up the meristem with its two products.
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