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What is the need of crossing the exotic breeds of cattle with local (Indian breeds, when exotic cattle have higher yield as compared to the hybrid breed of cattle ?

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Hybrids produced by cross breeding exotic breeds with local breed yields less milk as compared to the exotic breed. Even then, exotic breed cannot be incorporated in our dairy farms due to following reasons:
(i) Most of the exotic breeds have come from colder countries. Colder areas are limited in our country.
(ii) The exotic breeds will fall prey to local pests and pathogens easily as they are not resistant to them.
(iii) The feed available locally does not match with the feed required by the exotic breeds.
Therefore, best available option is to imprt a few exotic cattle and cross-breed them with local cattle for obtaining hybrid cattle acclimatised to local climate and resistant to local diseases.
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  6. Name any two macronutrients required by plants.

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  7. Which one is nutrient specific-fertilizer or manure ?

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  8. Which is the oldest method of crop improvement ?

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  9. Name one common disease of paddy.

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  11. Give one example of natural insecticide.

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  12. What are weeds ?

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  13. Write down two harmful effects of biotic factors on food grains.

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  14. What percent of moisture should be present in the food grains at the t...

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  15. Give one example of solid and one of liquid fumigant.

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  17. How the food grains should be dried on commerical basis ?

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  18. What is feed ?

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  19. Name one (a) Leguminous green fodder, (b) Non-green dry fodder.

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  20. Name one high yielding breed of cow and one of buffalo respectively.

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