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Please find below the answer:

12. The correct option is (4). Apart from good quality seeds, using appropriate agricultural practices are also important for getting a higher yield.
13. The correct option is (2). Manures are rich in humus but all nutrients might not be present in a proportionate amount in it. They will not solve the problem if the soil is particularly deficient in one or more specific nutrients.
14. Rust and Smut are diseases of plants caused by pathogenic fungi. 

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