$A$ boy learns typewriting and harmonium at the same time. He finds harmonium more easy to learn. This is:

In a cross-section of the spinal cord,$A, B, C, D$ and $E$ represent:

Which sentences are $WRONG$ about acquired reflex action?
$I$. These are non-heritable.
$II$. These are permanent.
$III$. They may disappear or re-appear.
$IV$. Example is knee jerk.

Given below are different components of a reflex arc:
$I$. Effector organ
$II$. Interneuron
$III$. Motor neuron
$IV$. Sensory neuron
$V$. Sensory receptor
Arrange these in the correct order of the action potential that follows a sensory receptor stimulation.

The watering of the mouth at the sight of delicious food is a result of:

The delicious food generally makes mouth watery. It is due to: