In monosynaptic is interneuron absent or is in inactive state
monosynaptic reflex A simple reflex that involves transmission of information from a sensory neuron to the appropriate motor neuron across a single synapse in the spinal cord. The knee-jerk reflex action is an example of a monosynaptic reflex (see stretch reflex).
The sensory neurons also make synaptic connections with another type of neuron in the spinal cord called an interneuron. Interneurons are so named because they are interposed between one type of neuron and another. The particular interneuron shown is an inhibitory interneuron
Interneuron is either absent &if present it is inhibitory (inactive)