Biology
Given below are some common reflexes in humans.
i. Quick closing of the eyelids when a strong beam of light is flashed across.
ii. Apply brakes to your vehicle if anything suddenly comes in front.
iii. Playing a musical instrument.
iv. Coughing reflex, when the food is swallowed, enters the windpipe.
The conditioned reflexes are:
- i and ii
- ii and iii
- iii and iv
- i and iv
Nervous System
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Answer
ii and iii
Reason — Quick closing of the eyelids when a strong beam of light is flashed across and coughing reflex, when the food is swallowed, enters the windpipe are natural or inborn reflexes. Playing a musical instrument and applying brakes are learnt by practice and thus they are conditioned reflexes.
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