Practice question
Question
Which enzyme catalyzes cleavage of carotenoids in ABA biosynthesis?
Explanation
Correct option is B, 9‑cis‑epoxycarotenoid dioxygenase. In Phytohormone ALL problems like this, the accurate statement is 9‑cis‑epoxycarotenoid dioxygenase; the others are common mix-ups. Not these: A) ACC oxidase; C) GA20 oxidase; D) LOG enzyme. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
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