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The error is in part 'B' and 'D' of the sentence. In part 'B' use of 'have'(plural auxiliary verb) is incorrect and needs to be replaced by singular auxiliary verb 'has'( in 'have revolutionised') as the sentence talks about a single approach. In option 'D' use of 'relevantly more' is contextually incorrect and needs to be replaced by 'more relevant' which suggests that field-work based approach has made economics more relevant in policy making. Hence, the answer is option b).
Turmeric is generally propagated by
“King of Fruits” is called _________
Which of the following mango varieties is most suitable for high-density planting?
The biting taste of black pepper is due to the presence of the alkaloid
Which test is used for testing the significance of mean differences?
Strawberry is commercially propagated by ___
Scooping is a special operation done in which of the following vegetable crop?
The Hill Reaction Takes Place in ___________.
Pollination in Mango is mainly
Fanging is related to