A) Trickling filter method
B) mudball technique
C) Both [a] and [b]
Correct Answer: C
Solution :[c] The International Rice Research Institute (IRRI) is an international research and training organization with headquarters in Los Bacos, Laguna in the Philippines. IRRI is known for its work in developing rice varieties that contributed to the Green Revolution in the 1960s which pre-empted the famine in Asia.
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