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Why are the spores of Bacillus thuringie...

Why are the spores of Bacillus thuringiensis used as bioinsecticide?

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Bacillus thuringiensis (Bt) is a soildwelling, gram-positive bacteria, used as a biological pesticide worldwide because of its specific toxicity against target pests in their larval stage. During sporulation, Bt strains produce crystal proteins (proteinaceous inclusions), called `delta` endotoxin, which have insecticidal action.
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Consider the following statements. I) Bt toxin gene has been cloned from the bacteria. II) Genetic engineering works only on animals and has not yet been successfully used on plants. III) Strains of Bacillus thuringiensis are used in producing bioinsecticidal plants. Which of the statements given above are correct?

which of the following statement is correct ? A. Single cell protein is rich in high quality proteins bit poor in fat B. BOD is the amount of oxygen that would be consumed if all the inroganic matter in one litre of water were oxidised by bacteria . C. Trichoderma sp are free living fungi that are effictive biocontrol agents of several pathogens. D. Bacillus thuingiensis are pathogens that attack insects and other arthrpods . E. Bacillus thuringiensis is first used biopesticide. F. Lactose enzyme is used in alcoholic fermentation . G. Mycorrhiza is a symbiotic associtation between fungi e.g. Glomus and vascular plant .

How are Baculoviruses and Bacillus thuringiensis use as bio-control agents? Why are they preferred over readily available chemical pesticides?