<prompt> Reflex is characterised by all exceptFractionationOcclusionPrepotentiationMinosynaptic  <response>: D Minosynaptic The basic unit of integrated reflex activity is the Reflex arc. Monosynaptic reflexes: Simplest reflex arc is one with a single synapse between afferent efferent neurons, such arcs are monosynaptic. Polysynaptic reflexes: Reflex arcs in which one or more interneurons are interposed between the afferent efferent neurons are polysynaptic. The number of synapses in the arcs wherein from two to many hundreds. In both types but especially polysynaptic reflex arcs, activity is modified by spatial temporal facilitation, occlusion, subliminal fringe effects other effects. Properties of Reflexes are Delay Summation Occlusion Subliminal fringefractionation Habituation and sensitization 