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Trends in Economic Zoology — Bio Zoology STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11Bio ZoologyTrends in Economic Zoology3 Marks
Question
What is the composition of pearl?
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Answer

Composition of pearl:
Pearl comprises water, organic matter, calcium carbonate, and residue.
  1. Water: 2-4%
  2. Organic matter: 3.5-5.9%
  3. Calcium carbonate: 90% and
  4. Residue: 0.1-0.8% carbonate: 90%

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