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Method of plant breeding for crop improvement - class-IX

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Desired improved variety of economically useful crops are raised by

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A
Hybridization
💡 Explanation:
Classical plant breeding includes hybridization (crossing) of pure lines, artificial selection to produce plants with desirable characters of higher yield, nutrition and resistance to diseases.  
The conventional method of breeding for disease resistance is hybridization and selection. 
Thus, the correct answer is option B.
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