Question

Assertion (A) Neuroglial cells are known as the packing cells of brain.
Reason (R) A type of neuroglial cells forms the myelin sheath around axon.

• A. If both A and R are true and R is the correct explanation of A
• B. If both A and R are true, but R is not the correct explanation of A
• C. If A is true, but R is false
• D. If A is false, but R is true

Answer 1

Answer: (A)

Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
The neuroglial cells are of three types, i.e. astrocytes, oligodendrocytes and microglia. Out of these, oligodendrocytes are the cells which form the myelin sheath around axon, thus are also called the packing cells of the brain. The other cells like astrocytes are responsible for the separation of two neurons by providing insulation and microglia are phagocytic cells. Nearly $50\%$ of all brain cells are neuroglia.