NEET · Biology · STD 12 - 8. microbes in human welfare

Microbe used for biocontrol of pest butterfly caterpillars is

A Saccharomyces cerevisiae
B Bacillus thuringiensis
C Streptococcus sp.
D Trichoderma sp.

Verified Solution

Answer & Solution

Correct Answer

(B) Bacillus thuringiensis

Step-by-step Solution

Detailed explanation

(b) : Biopesticides are those biological agents that are used for control of weeds, insects and pathogens. The microorganisms used as biopesticides are viruses, bacteria, protozoa, fungi and mites. Some of the biopesticides are being used at a commercial scale. Most important example is the soil bacterium, Bacillus thuringiensis (Bt). Spores of this bacterium produce the insecticidal cry protein. Therefore, spores of this bacterium kill larvae of insects which eat them.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Select the correct option. Column I - Column II

Column \(I\)	Column \(II\)
(A) Synapsis aligns homologous chromosomes	(i) Anaphase \(II\)
(B) Synthesis of \(RNA\) and protein	(ii) Zygotene
(C) Action of enzyme recombinase	(iii) \(G_2\) phase
(D) Centromeres do not separate but chromatids move towards opposite poles	(iv) Anaphase \(I\)
	(v) Pachytene

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