QUESTION TYPE: Must Be True
- Most commercial fertilizers just have macronutrients.
- Plants also need micronutrients.
- Raking grass removes micronutrients.
ANALYSIS: You can combine all three statements to say:
“If grass is raked away, then commercial fertilizers alone won’t be enough to keep plants healthy”
That’s all we know. All the wrong answers mix up sufficient and necessary.
- The stimulus said that the most widely available fertilizers only have macronutrients. But there could be some less common fertilizers that include micronutrients as well.
- This answer reverses sufficient and necessary. The stimulus says that commercial fertilizers are a sufficient condition for having macronutrients. But other things could also have macronutrients. Heck, you can buy potassium pills.
- CORRECT. This combines all three facts. If you rake away grass, then the soil will be missing micronutrients. Yet most commercial fertilizers don’t contain micronutrients.
- This is very tempting. Its true that commercial fertilizer + grass clippings seem like a sufficient condition for soil health. But this answer says that they are a necessary condition. We don’t know that. Maybe soil doesn’t need commercial fertilizers – forests don’t need fertilizer.
- If you rake up grass clippings, your soil will lack micronutrients, true. But there might be ways to restore micronutrients.
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