Scientists have extracted chemical A from the deadly nightshade plant. Chemical A can be used as a painkiller. Table 1 shows information about where chemical A is found. The scientists usually extract chemical A from the berries of the deadly nightshade plant. Suggest one reason why berries are used instead of leaves or roots.

The table shows that roots and leaves contain a higher concentration of chemical A (1.3g and 1.2g per 100g respectively) compared to berries (0.7g per 100g). Therefore, the reason for using berries is not based on getting the most chemical A per gram of tissue. A practical reason is that harvesting berries is much easier and less destructive than digging up roots. Harvesting roots would kill the plant, whereas harvesting berries allows the plant to survive and produce more berries in the future, making it a more sustainable practice.