Choose the ODD one out from the following terms given and name the CATEGORY to which the others belong:
Dendrites, Medullary sheath, Axon, Spinal cord
Topic: Parts of a neuron
Answer
Odd one out: SPINAL CORD. Category of the others: PARTS OF A NEURON (nerve cell).
Dendrites, the medullary (myelin) sheath and the axon are all parts of a single NEURON. The SPINAL CORD is a whole ORGAN, made of many thousands of neurons.
THE DISTINCTION being tested is one of SCALE — a part of a cell against a complete organ. Whenever a list mixes structures of very different size, that is usually the intended division.
The parts of a neuron: CYTON (cell body), DENDRITES (short branched processes that RECEIVE impulses), AXON (the single long process that CARRIES them away), MYELIN SHEATH (the insulating covering), and the NODES OF RANVIER (gaps in that sheath).