A) Cactoblastis cactorum
B) Anabaena
C) Bacillus thruingiensis
D) Rhizobium
Correct Answer: C
Solution :
Bacillus thuringiensis is a natural insecticide. It secretes a toxin protein thurisoide which is effective against insects like moths, flies, mosquitoes and beetles. Cactoblastis cactorum (cochineal insect) is a bioherbicide. In India and Australia the over-growth of cacti (Opuntia) was checked by this Anabaena is a blue green algae. It fixes the atmospheric nitrogen by the help of special cell called heterocyst. Rhizobium is symbiotic nitrogen fixing bacteria. It occurs in the root of legume plant and form root nodules.
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