Question

Circle the odd one out. Give reasons for your choice.

• A. Sensory nerve
• B. Motor nerve
• C. Associate nerve
• D. Synapse

Answer 1

The correct option is D

Synapse

The correct answer is option D.

Explanation of the correct option:

1. Neurons do not come in direct contact with each other.
2. They communicate with one another via synapses wherein the axon terminal of one neuron lies very close to the dendrites of another neuron.
3. A synapse is a junction where communication between two neurons occurs.

Explanation of incorrect options:

Option A:

1. Sensory nerves are made up of sensory neurons, which carry impulses from the sense organs to the brain or the spinal cord.
2. Optic nerve is an example of sensory nerve.
3. These nerves help us feel pain and other sensations.

Option B:

1. Motor nerves are made up of motor neurons, which carry impulses from the brain and spinal cord to the muscles and glands.
2. Nerves to salivary glands and the muscles of the eyeball are examples of motor nerves.
3. These nerves control muscle contraction allowing movements such as walking, kicking and wiggling fingers.

Option C:

1. Associate nerves are made up of both sensory and motor neurons and transmit impulses from one neuron to another.
2. The spinal nerves are good examples of mixed nerves.

Final answer: Odd one out is Synapse.