A) origin of life
B) cardiac reflexes
C) simple reflexes
D) conditioned reflexes
Correct Answer: D
Solution :
By training, a particular response can be obtained to a stimuli, other than the one which normally evokes that response. Such a reflex is known as the conditioned reflex. The conditioned reflexes were first demonstrated in 1920s by the Russian physiologist I. P. Pavlov. He found that the sight and smell of food reflexly cause flow of saliva in hungry animals.
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