Transgenic Plant
For developing herbicide resistance in transgenic plants which of the following approach/(es) is/are used?

A pathway should be introduced that detoxify the herbicide
Target molecule is made insensitive to herbicide
Target protein is overproduced
All of these

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Transgenic Plant
Low temperatures induce the expression of many cold-induced genes. Transgenic plants with improved cold tolerance have been produced by

expressing a gene for production of antifreeze (ethylene glycol) in plants
increasing evaporative cooling from leaf surfaces
cooling plants using the Peltier effect
expressing the protein that activates expression of these genes all the time in plants

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Transgenic Plant
In transgenic plants that have been manipulated to express patho-genesis-related (PR) proteins all the time it has been shown that

expression of two PR proteins provides some protection against a few pathogens
expression of one PR protein provides high levels of protection against many pathogens
these provide no protection at all against pathogens
these proteins trigger the production of other antimicrobial defenses

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