Biological termModerate0.6 marks
4(a)(ii)
Based on the diagram drawn above in (i) give a suitable term for each of the following descriptions:
The fluid present in the middle chamber of cochlea.
Topic: Endolymph
Previous-year question practice database
Answer
Exam answer
ENDOLYMPH.
Explanation
The prefixes settle it without any recall: ENDO- means WITHIN — endolymph is the fluid INSIDE the membranous labyrinth, including the middle chamber of the cochlea where the organ of Corti lies PERI- means AROUND — perilymph lies BETWEEN the membranous labyrinth and the bony labyrinth outside it
So the arrangement from outside in: bone → PERILYMPH → membranous labyrinth → ENDOLYMPH → organ of Corti.
Reading the prefix is quicker and safer than memorising which is which — and the same prefixes appear in endosmosis and exosmosis, endocrine and exocrine.
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