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Answer the following questions based on Bt-crops:Explain the mechanism by which Bt toxin kills the insects but not the bacterium which possesses the toxin.

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XII BOARDS PREVIOUS YEAR-QUESTION PAPER 2023-Question
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  2. (a)Write the scientific name of the nematode that infests the tobacco ...

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  3. Explain the following population interactions with the help of one exa...

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  4. The following pedigree chart shows the inheritance of a genetic disord...

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  5. The diagram shows the life cycle of a pathogenic protozoan. (i)Name...

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  6. Answer the following questions with respect to recombinant DNA technol...

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  7. Answer the following questions with respect to recombinant DNA technol...

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  8. Answer the following questions with respect to recombinant DNA technol...

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  9. Answer the following questions based on Bt-crops:Why do farmers prefer...

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  10. Answer the following questions based on Bt-crops:Name any two insects ...

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  11. Answer the following questions based on Bt-crops:Explain the mechanism...

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  12. Protein synthesis requires the services of all three types of RNAs,nam...

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  13. A homozygous tall pea plant with green seeds is crossed with a homozyg...

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  14. A homozygous tall pea plant with green seeds is crossed with a homozyg...

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  15. A homozygous tall pea plant with green seeds is crossed with a homozyg...

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  16. A homozygous tall pea plant with green seeds is crossed with a homozyg...

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  17. Given below is a diagrammatic representation of a human ovum. (i) I...

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  18. How does an ovum ensure the entry of a single sperm during fertilisati...

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  19. Double fertilisation is an event unique to all flowering plants.Explai...

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  20. Give reasons for the following: (i)A seed of an orange has many embryo...

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