Question

scientists have produced kits that allow farmers to test their crops for pests. these kits provide fast and accurate results, allowing farmers to apply the appropriate pesticides only when they will be most effective. widespread use of these kits will most likely benefit society by reducing which of the following?
the amount of land being converted from woodlands to farmlands
the ability of crops to adapt and become resistant to certain insects
the length of time between picking a crop and the crop being available for sale
the quantity of pollutants reaching groundwater sources that supply drinking water

Explanation:

1. Analyze Option A: Converting woodlands to farmlands relates to land use change, not directly to pesticide - testing kits. The kits are about pesticide application, not land conversion. So this option is incorrect.
2. Analyze Option B: Using pesticide - testing kits to apply pesticides only when needed is not related to the crop's ability to adapt to insects. In fact, over - use of pesticides might reduce this ability, but the kits help in targeted use, not in reducing the crop's adaptive ability. So this option is incorrect.
3. Analyze Option C: The time between picking a crop and it being available for sale is related to post - harvest processes like processing, transportation, and storage, not to pesticide - testing kits. So this option is incorrect.
4. Analyze Option D: When farmers use these kits to apply pesticides only when necessary, they will use less pesticides. Pesticides can be pollutants, and less pesticide use means less of these pollutants will reach groundwater sources that supply drinking water. So this option is correct.

Answer:

D. the quantity of pollutants reaching groundwater sources that supply drinking water