Answer :
Final answer:
Maria is likely to struggle distinguishing sweetness between lemonades with higher sugar concentrations, such as 9 teaspoons vs. 10 teaspoons. This is because the relative change in sweetness becomes less noticeable as sugar concentration increases.
Explanation:
The subject here is the human perception of sweetness, specifically as it relates to Maria's ability to distinguish the sweetness of lemonades with varying levels of sugar. This is a biological concept as it involves the functionality of gustatory cells, G protein-coupled receptors, and glucose molecules in saliva. With specific respect to the options provided, Maria is most likely to struggle distinguishing the sweetness between lemonades with higher sugar concentrations such as 9 teaspoons vs. 10 teaspoons. This is due to the fact that the perceptible difference in sweetness diminishes as the overall sugar quantity increases. A small increase in sugar at higher concentration levels tends to be less detectable than the same increase at lower concentration levels. For instance, the relative difference in sweetness between 1 teaspoon and 2 teaspoons of sugar is quite significant as the quantity of sugar is doubled. However, as sugar concentration increases, the relative change in sweetness becomes less noticeable - there's a smaller perceptual difference between 9 teaspoons and 10 teaspoons of sugar than there is between 1 teaspoon and 2 teaspoons of sugar. As evidenced during the taste testing event, Maria was able to discern the sweetness differences at lower concentrations, but struggled when the sugar concentrations got higher.
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