Question

Amber is
A. Fossil resin
B. Used for making X-ray sheets
C. Extracted from pinus exceisa
D. All of the above

Answer 1

Amber most comes from the pine trees. Pine trees are the members of kingdom gymnosperms. Gymnosperms are a woody, vascular seeds plant whose seeds are not enclosed within the ovary and remained exposed. Medium-sized trees or tall trees and shrubs are included in kingdom gymnosperms.

Step by step answer: Amber is a fossilized tree resin that has been valued for its color and natural beauty. Amber is much valued from antiquity to the present as a gemstone. Many types of decorative objects are made up of amber. Amber is used in jewelry. It has also been used as a healing agent in folk medicine. There are five classes of amber that are defined on the basis of their chemical constituents. Amber arises as soft, sticky tree resin. Plant and animal materials are used as inclusions in amber. Resinite is amber occurring in coal seams. In New Zealand, the term ambrite is applied to coal seams. Amber is mostly secreted by the conifers trees included pinus. It represents fossil within fossils.
It is used as varnish and lacquers and burned as incense. It is also used in skin products. Amber has been used in building material also. Amber is heterogeneous in nature but consists of several resinous bodies that are more or less soluble in alcohol, ether, and chloroform and associated with an insoluble bituminous substance. Amber is a macromolecule by free radical polymerization of several precursors in the labdane family, e.g. communic acid, biformene, etc.
So, the correct option is option A. Fossil resin.

Note: These labdanes are diterpenes and trienes. As amber matures over the years and more polymerization takes place as well as isomerization, recycling reaction occurs. When heated above 200°C amber decomposes, yielding an oil of amber, and leaves a black residue which is known as "amber colophony", or "amber pitch".