$A$ nerve impulse is transmitted from one neuron to another through the junctions called

Assertion $(A) :-$ Impulse transmission across an electrical synapse is always faster than that across a chemical synapse.
Reason $(R) :-$ Electrical current can flow directly from one neuron into the other across electrical synapses.

Receptor sites for neurotransmitters are present on

Most insecticides affect which system of an insect?

Assertion : Transmission of nerve impulse across a synapse is accomplished by neurotransmitters.
Reason : Transmission across a synapse usually requires neurotransmitters because there is a small space,i.e.,synaptic cleft,that separates one neuron from another.

The receptor sites for neurotransmitters are present on ..........