Reading — Matching headings
⏱ ~3-min readAceMark Guide
What this topic is really about
The correct heading for a paragraph about the chemistry of light production is related to the molecular process of generating light.. That paragraph centres on luciferin reacting with oxygen and luciferase to release energy as light, so a heading about how molecules generate cold light is the best fit.
The relevant paragraph explains that organisms use light to lure prey, confuse predators through counterillumination, and attract mates, all survival functions, so the hunting/hiding/signalling heading fits best.
See the mechanism
The paragraph explains how luciferin reacts with oxygen and luciferase to produce light, which matches the heading about molecules generating cold light. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.
An exam-style question, fully explained
Which heading best fits the paragraph describing the chemistry of light production?
- Identify what the question tests: Which heading best fits the paragraph describing the chemistry of light production.
- That paragraph centres on luciferin reacting with oxygen and luciferase to release energy as light, so a heading about how molecules generate cold light is the best fit.
- The other headings describe different paragraphs or topics not central to the chemistry.
- Why it matters: The paragraph explains how luciferin reacts with oxygen and luciferase to produce light, which matches the heading about molecules generating cold light. The other options do not accurately describe the chemical process. The heading about defence against predators, the history of marine biology, and the darkness of the deep sea are not relevant to the chemistry of light production.
Traps the examiner sets
- Some readers may be misled by the context of the deep sea and marine biology, and choose a heading that is related to the broader topic rather than the specific chemical process described in the paragraph. They may also overlook the key words 'luciferin', 'oxygen', and 'luciferase' that indicate the molecular process.
Test your recall
Answer each from memory — you'll see instantly whether you're right and why.
Run a focused 10-question mini-mock on Reading — Matching headings and see it stick.
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