Reflex Action and Reflex Arc Questions in English

(A) In the provided diagram of a reflex arc:
$P$ points to the dorsal root ganglion,which contains the cell bodies of sensory (afferent) neurons.
$Q$ points to the interneuron (relay neuron) located in the grey matter of the spinal cord,which connects the sensory neuron to the motor neuron.
$R$ points to the muscle fiber,which acts as the effector organ that responds to the stimulus.
Therefore,the correct identification is $P$: Dorsal root ganglion,$Q$: Interneuron,$R$: Muscle fiber (Effector). However,looking at the options provided,option $A$ correctly identifies $P$ and $Q$,and the term 'Efferent end plate' is often used to describe the neuromuscular junction at the effector site $R$.

(B) Acquired reflex actions (also known as conditioned reflexes) are learned behaviors developed through experience or practice.
$I$. They are non-heritable because they are acquired during an individual's lifetime,not inherited from parents. This statement is correct.
$II$. They are not permanent; they can be forgotten or extinguished if not practiced. This statement is wrong.
$III$. They may disappear or re-appear based on practice or reinforcement. This statement is correct.
$IV$. The knee-jerk reflex is an example of an innate (unconditioned) reflex,not an acquired one. This statement is wrong.
Therefore,the wrong statements are $II$ and $IV$.