Which set is of benificial insects to man [CPMT 1972, 84]
A) Honey bee, lac insect, cochineal insect
B) Silk worm, honey bee, wasp
C) Honey bee, silk worm, cockroach
D) Sand fly, butterfly, honey bee
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a is right option because all three are useful honeybee in production of honey cochineal in inducing polyploidy
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