PrepTest 88, Section 3, Question 7
Late blight is a disease affecting tomato plants that causes blue-grey patches to appear on the leaves. Applying a copper solution to the blighted plants is an effective treatment for the disease. Therefore, late blight must be caused by a deficiency of copper in the plant's mineral intake.
Late blight is a disease affecting tomato plants that causes blue-grey patches to appear on the leaves. Applying a copper solution to the blighted plants is an effective treatment for the disease. Therefore, late blight must be caused by a deficiency of copper in the plant's mineral intake.
Late blight is a disease affecting tomato plants that causes blue-grey patches to appear on the leaves. Applying a copper solution to the blighted plants is an effective treatment for the disease. Therefore, late blight must be caused by a deficiency of copper in the plant's mineral intake.
Late blight is a disease affecting tomato plants that causes blue-grey patches to appear on the leaves. Applying a copper solution to the blighted plants is an effective treatment for the disease. Therefore, late blight must be caused by a deficiency of copper in the plant's mineral intake.
The flawed nature of the argument can be most effectively demonstrated by noting that, by parallel reasoning, we could argue that
since radiation therapy can be an effective treatment for some types of cancer, it follows that higher doses of radiation will be more effective in treating those same types of cancer
since scurvy is caused by a deficiency of vitamin C, it follows that vitamin C is an effective treatment for scurvy
since malnutrition can cause health problems, it follows that the more food you eat, the healthier you will be
since paracetamol is effective in treating headaches, it follows that headaches are caused by a lack of paracetamol in the bloodstream
since calcium deficiency in apple trees causes brown spots on the apples, it follows that apple trees growing in soils that are rich in calcium will not produce apples with brown spots
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