Practice question
Question
Correct sequence of ABA‑induced stomatal closure begins with:
Explanation
ABA binding to receptor (C) is correct here. This is core Phytohormone ALL: once you know the definition or pathway step, ABA binding to receptor is the clear fit. The wrong ones are A) Ion efflux; B) ROS formation; D) Ca2+ channel opening. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.
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