Question

how can we come to know that there is a scarcity of water in plants​

Answer 1

Answer:

In case of water deficiency, plants will slow down their entire production mechanism and rearrange the photosynthesis apparatus leading to stomatal closure. ... Wilting-Tugor Pressure – Plants that don't get enough water will wilt sooner than later. Oftentimes this is due to cell inflation

Step-by-step explanation:

got from Google

Answer 2

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When water stress occurs, whether caused by drought or root impairment, many invisible processes are affected. The first obvious effect of water stress is wilting because turgor pressure, which inflates plant cells and keeps them erect, is lost.

MIT engineers have created sensors that can be printed onto plant leaves and reveal when the plants are experiencing a water shortage. This kind of technology could not only save neglected houseplants but, more importantly, give farmers an early warning when their crops are in danger, says Michael Strano, the Carbon P.