MCQ
Frequency of sound is discriminated by:
- AThe type of fluid $-$ perilymph or endolymph.
- ✓The site at the cochlear coi.
- CThe intensity of movement of basilar fibres of cochlea.
- DAll of these.
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$(ii)$ Stomata regulate the process of ....$b$..... and gaseous exchange
Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.