Q.The common bottle cork is a product of
a. Dermatogen
b. Phellogen
c. Xylem
d. Vascular cambium

The cork cambium, also called the phellogen, is the second lateral meristem involved in secondary growth (alongside the vascular cambium), and it is responsible for producing the entire periderm - the protective tissue that replaces the epidermis once a stem or root has thickened beyond what the epidermis can stretch to cover. Unlike the vascular cambium, which is built of two structurally distinct cell types (fusiform and ray initials), the cork cambium is comprised of a single, homogeneous population of meristematic cells. It can arise from a range of different starting tissues depending on the species and organ - the epidermis, the cortex, the phloem, or the pericycle (in both cases an extrastelar origin, i.e., outside the stele) - and once established, its cells divide periclinally, producing neat, radially arranged files of daughter cells on both faces simultaneously. …