Discussion
Which of the following display insecticidal activity ?
Answer: D
The species with insecticidal activity is Bacillus sphaericus.
B. sphaericus (now Lysinibacillus sphaericus) makes a binary protein toxin, formed in crystals during sporulation, that kills mosquito larvae of Culex and Anopheles. It is used as a biological larvicide in vector control, alongside the better-known B. thuringiensis.
B. cereus is best known for food poisoning, B. subtilis is a common soil bacterium and industrial enzyme producer, and B. stearothermophilus is a thermophile whose spores are used to test sterilisers.
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