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Zorluk: OrtaNecessary Assumption

Botanist: Ghost orchid seeds require a specific soil fungus to germinate. In Silverwood Forest, this fungus is found exclusively in the decomposing bark of fallen elder-pine trees. Therefore, the new forest management policy, which mandates the removal of all fallen elder-pine trees from Silverwood to reduce wildfire risk, will inevitably cause the forest's ghost orchid population to decline.

Which one of the following is an assumption on which the botanist's argument depends?

  1. A
    All species of fungi that grow in the decomposing bark of fallen elder-pine trees are required for the successful germination of ghost orchid seeds.
  2. B
    If the fallen elder-pine trees are not removed from Silverwood Forest, the ghost orchid population will continue to grow.
  3. C
    Silverwood Forest currently contains a higher concentration of fallen elder-pine trees than any other nearby forest.
  4. The ghost orchid population in Silverwood Forest cannot maintain its current numbers solely through reproductive methods that do not involve seed germination.Cevap
  5. E
    The new forest management policy was implemented primarily to protect nearby residential areas from wildfires, not to alter the forest's ecosystem.

Cevap

The ghost orchid population in Silverwood Forest cannot maintain its current numbers solely through reproductive methods that do not involve seed germination.
The argument concludes that removing fallen elder-pine trees will inevitably cause the ghost orchid population to decline. This relies on the premise that the seeds require a fungus found only on these fallen trees. However, if the orchids can reproduce effectively without seeds (e.g., vegetatively), the population might not decline. Therefore, the argument must assume that the orchids cannot maintain their numbers solely through non-seed methods.

Adım Adım Çözüm

1
Identify the conclusion and premises of the argument.
Conclusion: The policy to remove fallen elder-pine trees will inevitably cause the ghost orchid population to decline. Premises: Ghost orchid seeds require a specific fungus to germinate, and this fungus is found exclusively on the decomposing bark of fallen elder-pine trees.
Deconstructing the argument structure is the essential first step in identifying any logical gaps.
2
Find the logical gap between the premises and the conclusion.
The premises establish that seed germination will be halted. The conclusion claims the entire population will inevitably decline. The gap is the assumption that seed germination is strictly necessary to maintain the population size.
A valid argument must have no gaps between the provided evidence and the final claim.
3
Apply the Negation Test to the potential assumption.
Negating the correct statement yields: 'The ghost orchid population CAN maintain its current numbers solely through reproductive methods that do not involve seed germination.' If this is true, the loss of seed germination would not cause a population decline, destroying the argument.
The Negation Test is the definitive way to prove if an assumption is truly necessary for an argument.

Anahtar Kavram

Necessary Assumption and the Negation Test
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Konular

Necessary Assumption

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