Source of Natural Rubber

Natural rubber is a versatile material obtained from a specific part of certain plants. It is essentially a natural polymer, known scientifically as polyisoprene.

The primary source of commercial natural rubber is the latex, a milky fluid, tapped from the rubber tree, scientifically known as Hevea brasiliensis.

Extraction Process from Plant Part

The latex is collected by making careful incisions in the outer layer of the tree's bark. This process is called 'tapping'. The latex flows out from the inner bark layers and is collected in cups.

The collected latex is then processed to remove water and other impurities, eventually solidifying into the raw rubber we use.

Analysis of Options

Let's look at why the bark is the correct source:

• Root: Roots are typically involved in anchoring the plant and absorbing water and nutrients; they do not produce the latex for rubber.
• Bark: The bark is the outer protective layer of the tree trunk. In rubber trees, specialized latex vessels are located within the bark, making it the correct source for tapping.
• Leaf: Leaves are primarily responsible for photosynthesis and do not contain the latex required for rubber production.
• Flower: Flowers are involved in plant reproduction and do not yield rubber.
• Fruit: Fruits contain seeds and are involved in reproduction; they are not the source of natural rubber latex.

Therefore, the natural rubber is extracted from the bark of the rubber tree.