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Given reason :

ABA is described as an antitranspirant.

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1. ABA is a growth inhibiting hormone. 

2. ABA is responsible for causing efflux of K+ ions from guard cells of stomata. 

3. As a result of this, osmotic changes occur and guard cells become flaccid resulting in closure of stomata. 

4. Transpiration mainly occurs through open stomata and due to closure the activity is checked. Hence it is described as antitranspirant.

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