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{:((a),"Stress hormone",-"Abscisic acid ...

`{:((a),"Stress hormone",-"Abscisic acid "),((b),"Ganongs potometer ", - "Rate of transpiration"),((c),"Necessary evil ",-"Curtis"),((d),"Succinic acid",-"Opening of stomata"):}`

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The correct Answer is:
D
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