For difficult transition questions, compare the precise logical functions of plausible options. In particular, distinguish a restatement, which expresses the same claim again, from a refinement, which narrows, qualifies, or makes the earlier claim more exact.
Hints
- Hint 1
Track the scope of the claim
Consider how the word “only” affects the earlier description of the timing patterns as opposites.
- Hint 2
Distinguish refinement from restatement
Determine whether the final sentence repeats the preceding claim unchanged or limits the conditions under which that claim is accurate.
Step-by-step
- Step 1
Identify the initial characterization
The text calls the two timing patterns opposites because one plant opens its pores mainly at night while the other opens them after sunrise.
- Step 2
Examine how the final sentence changes that claim
The final sentence limits the sense in which the patterns are opposite: they differ with respect to clock time, but both avoid the locally costliest period for gas exchange.
- Step 3
Choose the relationship
Because the final sentence makes the preceding characterization narrower and more exact rather than merely repeating it, a transition that signals refinement is needed.