Pioneer work on conditioned reflex was done by

  • A
    Karmer
  • B
    Pavlov
  • C
    Darwin
  • D
    Lamark

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The nerve cells,brain,and spinal cord or central nervous system develop from which embryonic layer?

$A$: $Hydra$ has a nerve net but no brain.
$R$: All its neurons are apolar and connected.

In Hydra,neural organization is comprised of:

$A-$ Humans can sense changes in the environment.
$R-$ Sensory organs detect all types of changes in environment.

The minimum time interval required between the application of a stimulus and the production of a response is known as:

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