Describe ABA signaling model to explain stomatal movements with the help of well labelled diagram.

Abscisic acid (ABA) is a plant hormone that regulates various physiological processes such as seed dormancy, stress responses, and stomatal movements. ABA signaling model explains how ABA regulates stomatal movements by controlling the osmotic balance in guard cells. The model describes the following steps:

1. ABA biosynthesis and transport: ABA is synthesized in various tissues of the plant and then transported to the guard cells where it is required.

2. ABA binding to receptor: ABA binds to specific receptor proteins on the surface of the guard cells, which triggers the downstream signaling pathway.

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