(D) mussel
quatic insects in freshwater nursery are controlled by application of
1) soap oil emulsion
(B) cowdung
C) groundnut oil cake
(D) mustard oil cake
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Answer:
(D) Mustard oil
Explanation:
Spraying oil on water surface to control insects which come up to take atmospheric air, is a well- known principle, and a routine practice in malaria control. It is also reported that some fish farmers in Bengal use mustard oil to segregate Notonectids and carp fry when they are kept in hapas.
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