Select the INCORRECTLY spelt word from the given sentence. Behavioural…

Spot-the-error / "select the incorrectly spelt word" questions test whether you can recognise a word's standard, dictionary-accepted spelling inside continuous prose. The reliable method is to isolate each candidate word from the sentence and compare its letter-by-letter sequence against the word it is meant to represent — paying special attention to words built from Greek or Latin roots, where letter order (e.g., a root beginning "heur-" as in "heuristic" or "eureka") is a common source of transposition errors.

1. "realm" (r-e-a-l-m) — a domain or sphere of activity; the spelling matches its standard form.

2. "psychology" (p-s-y-c-h-o-l-o-g-y) — from Greek psykhe + logia; the spelling matches its standard form.

3. "heruistics" — intended to represent "heuristics", from the Greek root heuriskein ("to find/discover"), correctly spelled h-e-u-r-i-s-t-i-c-s. The sentence's form transposes the second and third letters of the root, giving h-e-r-u-i-s-t-i-c-s — a misspelling.

4. "biases" (b-i-a-s-e-s) — plural of "bias"; the spelling matches its standard form.

Reading the root aloud alongside familiar cognates such as "eureka" and "heuristic" confirms the accepted letter order is h-e-u-r-, not h-e-r-u-; substituting the standard spelling "heuristics" into the sentence changes no meaning, confirming this is purely a spelling error rather than a different intended word.

Therefore, "heruistics" is the incorrectly spelt word in the sentence.