Question

Cork/bottle cork is formed from
A. Cork cambium (phellogen)
B. Vascular cambium
C. Phloem
D. Xylem

Answer 1

Hint: Cork cambium is a thin outermost layer of trees. It is also called phellogen. It plays a role in protecting the trees from fungal infections.

Complete answer:
Trees contain meristematic tissues, one of them is cork cambium which is a ring of meristematic tissue (lateral meristem). It is a part of the epidermis and one of the layers of bark. The cork cambium is located between the cork and primary phloem and is responsible for secondary growth. It is usually found in woody and many herbaceous dicots, and some monocots as well. The cork cambium is formed from the inner-outer sheath of bark, periderm. The periderm consists of three different layers; Phelloderm which is the inner layer of cork cambium and consists of parenchyma cells; Phellogen also called cork cambium which is a meristematic tissue that gives rise to periderm; Phellem which are dead cells and air-filled protective tissue of the trees. Example cork oak forms uniform and continuous regenerative tissue. A healthy oak tree contains 2.5-5cm of new cork which is formed in almost 3-10years. It is usually used as wine stoppers, bulletin boards, hot pads to protect tables from hot pans, insulation, coasters, fishing bobbers, handles for fishing rods and tennis rackets, etc.

Therefore, the correct answer is option A. Cork cambium.

Note:Vascular cambium is produced from xylem and phloem. Phloem is a complex tissue and is known to transport food material from stem to leaves while xylem transport water.