Abscisic acid is a mildly acidic dextrorotatory cis sesquiterpene growth hormone which functions as a general growth inhibitor by counteracting other hormones (auxin, gibberellins, and cytokinins) or reactions mediated by them.
It is also called the stress hormone because the production of hormone is stimulated by drought, water logging and other adverse environmental conditions.
ABA is synthesized in many parts of the plants but abundantly inside the chloroplasts of green cells.
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ABA is synthesized in many parts of the plants but abundantly inside the chloroplasts of green cells. Hence, the correct answer is chloroplast.