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Why do we need to study stomatal density and transpiration rates together? DO NOT say it’s...

Why do we need to study stomatal density and transpiration rates together? DO NOT say it’s correlated or has a relationship: I need way more explaining than that for the vote.
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Stomatal density is positively correlates with the transpiration rate. In addition, studying stomatal density and transpiration rate together is used to investigate as a potential tool for enhancing drought tolerance or nutrient uptake by plants. Plants with less stomata shows the reduced levels of transpiration, conserve soil moisture and are highly drought tolerant but show little reduction in shoot nitrogen concentrations especially when water availability is restricted. In contrast, plants with more density of stomata have a greater capacity for nitrogen uptake, except when water availability is restricted. In addition, it has been shown that increasing transpiration can enhance nutrient uptake when water is plentiful. So, studying stomatal density and transpiration rate together enables us to understand the capacity for nitrogen uptake, and drought tolerance of the plants.

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