AIIMS 2018 Botany Bt Crops Assertion Reason Question
Assertion: In cycas, nitrogen fixation is found
Reason: In coralloid roots of cycas, cyanobacteria present
Both assertion and reason are true, and reason is the correct explanation for assertion.
Both assertion and reason are true, but reason is not the correct explanation for assertion.
Assertion is true, but reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
Option A is correct because the assertion accurately states that plants with genes from Bacillus thuringiensis (Bt) develop resistance to insects, as these plants produce Bt proteins that are toxic to certain pests. However, the reason provided is incorrect because the conversion of the protoxin into the active toxin occurs in the gut of the insect after ingestion, not within the transgenic plant itself. Other options are incorrect because they either misinterpret the relationship between the assertion and reason or incorrectly classify the truthfulness of the statements. Understanding this mechanism highlights the role of genetic engineering in enhancing pest resistance in crops.
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