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90% of pearl is ..............

90% of pearl is ...........

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calcium carbonate
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Assertion: The best quality of pearl is known as lingha pearl and obtained from marine oysters. Reason: Nacre is secreted continuously by the epithelial layer of the mantle and deposited around the foreign particle.

FULL MARKS-TRENDS IN ECONOMIC ZOOLOGY-Additional Questions Solved ( Fill in the Blanks.)
  1. Most of the marine prawns caught along the Indian coast belongs to the...

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  2. Metapenaeus dobsoni is a species of ......

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  3. Fresh water bivalve .......... is used in artificial pearl culture.

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  4. The piece of tissue which is inserted inside the mantle of the oyster ...

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  5. 90% of pearl is ...........

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  6. The best quality of pearl is obtained from ............ oysters.

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  7. The practice of breeding and raising livestock is called as ..........

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  8. .......... increases homozygosity and exposes harmful recessive genes.

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  9. ........... helps to produce new and favourable traits, new breeds and...

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  10. ............ is a technique in which the semen collected from the male...

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  11. ................ is the production and marketing of milk and its produ...

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  12. Sindhi, Gir, Jersy are ............. breeds.

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  13. ........... is the rearing and propagation of avian species.

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  14. ............ is the type of chicken breeds well known for fast growth ...

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  15. Caring and management of young chicks for 4-6 weeks immediately after ...

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  16. Ranikhet is a ............ disease.

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  17. Domesticated ducks have been derived from the wild duck named ...........

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  18. Droppings of poultry can be used as .......... in fields.

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  19. The droppings of poultry are rich in nitrogen, potash and .....

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  20. The eggs and poultry meat are the richest sources of ............... a...

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