Bottle cork is obtained from
A. Betula Vulgaris
B. Eucalyptus
C. Calotropis procera
D. Quercus suber

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Hint:Cork is made up of suberin, a hydrophobic substance. Because of its impermeable, buoyant, elastic, and fire retardant properties, it is used in a variety of products, the most common of which is wine stoppers. The maximum yield is obtained from European Countries.

Complete answer: Cork is an impermeable buoyant material, the phellem layer of bark of an Oak tree, that is harvested for industrial use primarily from Quercus suber (the cork oak), which is native to southwest Europe and northwest Africa.
The raw material for cork products is harvested from the cork oak tree. the cork tree is harvested when it is about twenty years old. The primary harvest of the yield is of poor quality, and can only be used to make agglomerated cork products. Consequently, harvests occur at nine-year intervals, when the cork layer reaches a thickness of two to five centimeters. Each tree has a productive life of about \[150\] years. Cork has less density, is buoyant, is impermeable to fluids, has a less thermal coefficient, exhibits elasticity and deformation without fracturing underneath compression, and also has enough durability. Such characteristics result from the factors of its cellular structure, primarily its cell dimensions and topology, and from the chemical composition of the cell wall. The characteristics of the two main chemical components are suberin and lignin, which represent \[53\% \] and \[26\% \] respectively, of the cell wall.

So, the right answer is Option D)

Note: The bottle cork is a product of phellogen. Phellogen produces cork on the outside side. It consists of the dead and suberised rectangular cell. The cork contains tannins, and hence appears brown.