Bioluminescent beetles called fireflies may seem to create flashes of light randomly, but each species of firefly actually has its...
GMAT Craft and Structure : (Structure) Questions
Bioluminescent beetles called fireflies may seem to create flashes of light randomly, but each species of firefly actually has its own special series of repeated flashes and pauses. These unique ________ allow fireflies of the same species to find each other.
Which choice completes the text with the most logical and precise word or phrase?
quantities
decorations
patterns
agreements
Step 1: Decode and Map the Passage
Part A: Create Passage Analysis Table
| Text from Passage | Analysis |
|---|---|
| "Bioluminescent beetles called fireflies may seem to create flashes of light randomly," |
|
| "but each species of firefly actually has its own special series of repeated flashes and pauses." |
|
| "These unique ______" |
|
| "allow fireflies of the same species to find each other." |
|
Part B: Provide Passage Architecture & Core Elements
Main Point: Firefly light flashes aren't random but are species-specific sequences that help fireflies identify their own kind.
Argument Flow: The passage moves from appearance (seemingly random flashes) to reality (each species has distinct sequences) to function (these sequences enable species recognition).
Step 2: Interpret the Question Precisely
This is a fill-in-the-blank question asking us to choose the best logical connector. The answer must create the right relationship between what comes before and after the blank.
Step 3: Prethink the Answer
- The blank refers back to "special series of repeated flashes and pauses."
- We need a word that: Can describe a series of repeated actions with timing, Makes sense when modified by "unique", Logically connects to species identification.
- The word should capture the idea that these flash sequences have a recognizable structure or arrangement that fireflies can distinguish.
- So the right answer should be a noun that describes organized, repeating sequences that can be recognized and differentiated.
quantities
- "Quantities" refers to amounts or numbers of things.
- Doesn't make sense to describe a series of timed flashes as "quantities".
- Creates unclear meaning about what's being measured.
decorations
- "Decorations" suggests ornamental features meant for visual appeal.
- While firefly lights might appear decorative, the passage emphasizes their communication function.
- Trap: Students might focus on the visual beauty of firefly lights rather than their biological purpose.
patterns
- "Patterns" perfectly describes a series of repeated flashes and pauses with specific timing.
- Creates logical meaning: unique patterns enable species recognition.
- Matches our prethinking about organized, recognizable sequences.
agreements
- "Agreements" implies conscious negotiations between parties.
- Fireflies don't consciously decide on their flashing sequences—this is biological behavior.
- Creates illogical meaning in the context of animal communication.