Pearl is a shining globular concretion found within the shell of bivalves oysters and clams etc. Mostly the pearl oyster off West Coast are more productive and produce the quality of known as Lingha pearls. The pearls are of variable colours and shapes but Rainbow coloured pearl video is very rare. The most productive pearl in India is a gulf of Mannar, Gulf of Kutch, Pak bay and Baroda. Where is formed of a number of nacreous there's a round of foreign body, secreted by nacre secreting cells mantle which prevents irritation to the mollusc. So take this quiz and increase your knowledge about Mollusc Industry or Pearl Culture in India.
1. Perl is secreted by...
A. Prismatic layer
B. Connective tissue of mantle
C. Columnar epithelium of mantle
D. Ciliated epithelium of mantle
2. Pearl oyster belongs to a class...
A. Cephalopoda
B. Palecypoda
C. Gastropoda
D. Scaphopoda
3. Which animal is harmful to the pearl industry?
A. Euspongia
B. Cliona
C. Pinctada
D. Solea
4. The father of the pearl industry is...
A. Kokichi mikimoto
B. Sungut sen
C. Kojimara
D. None of these
5. The best quality Pearl is...
A. Ruby
B. Neelam
C. Lingha
D. Emerald
6. Which Layer of the Mantle is the mother of the pearl?
A. Nacreous
B. Periostracum
C. Prismatic
D. Mental epithelium
7. The nacreous layer of Pearl consists of...
A. Chitin
B. Conchyolin
C. Calcium carbonate and conchyolin
D. Calcium carbonate
8. Which is not a very productive Pearl Reef in India?
A. East coast
B. Gulf of Kutch
C. Gulf of Mannar
D. Pak bay
9. For how long oysters are kept in culture cage.
A. 24 hours
B. 2 to 4 days
C. 1 month
D. 10 to 20 days
10. The time required for complete per formation is...
A. 3 to 6 years
B. 2 to 3 years
C. 6 to 8 months
D. 1 to 2 months
11. The most superior quality pearl is of the genus...
A. Heliotis
B. Mytilus
C. Placuna
D. Pinctada
12. A prismatic layer of Pearl is secreted by...
A. Complete outer surface of the Mantle
B. Complete inner surface of shell
C. Edge of the mantle
D. Only that reason of mantle which surrounds foreign body
13. What is the scientific name for the pearl oyster commonly used in pearl culture in India?
A. Pinctada margaritifera
B. Pinctada fucata
C. Pinctada maxima
D. Pinctada radiata
14. Which government agency in India is involved in the promotion and regulation of pearl culture activities?
A. Ministry of Agriculture and Farmers Welfare
B. Ministry of Commerce and Industry
C. Marine Products Export Development Authority (MPEDA)
D. Indian Council of Agricultural Research (ICAR)
15. What is the main purpose of using a mother-of-pearl bead as a nucleus in pearl cultivation?
A. To produce larger pearls
B. To enhance the color of pearls
C. To minimize rejection by the mollusk
D. To speed up the pearl formation process
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