Posted by Mr. S S Venkateshwar on Saturday, 19th May 2012
PEARL FARMING----
Valuable pearls occur in the wild, but they are very rare. These are called Natural Pearls. They are formed inside the shell of certain mollusks: as a defense mechanism to a potentially threatening irritant such as a parasite inside its shell, injuring the mantle tissue. The mollusk creates a pearl sac to seal off the irritation. Pearls are grown artificially by implanting (nuc..
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