16Hit1600
Expression of IdeasVery hardExplaining why one decline threatens another species

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A rare orchid grows in a single valley. - It is pollinated by only one species of moth. - The orchid sets seed only when it has been pollinated. - The moth's numbers have halved since 2000. The student wants to explain why the moth's decline threatens the orchid.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Because the orchid sets seed only when pollinated, and only one species of moth pollinates it, the halving of that moth's numbers since 2000 puts the orchid's survival at risk.Correct
  2. B. The orchid grows in a single valley.
  3. C. The moth's numbers have halved since 2000.
  4. D. The orchid is pollinated by a moth.

Answer: A. Because the orchid sets seed only when pollinated, and only one species of moth pollinates it, the halving of that moth's numbers since 2000 puts the orchid's survival at risk.

The dependence, and the decline.

Why the other answers are wrong

B. The orchid grows in a single valley.
Location, no link to the moth.
C. The moth's numbers have halved since 2000.
The decline without the dependence.
D. The orchid is pollinated by a moth.
The link without the threat.

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