Question

Assertion (A): The arrangement of white and gray matter is the same in both brain and spinal cord.

Reason (R): Gray matter consists of cell bodies of the neuron, whereas white matter contains the axons of the nerve cells. One region is termed as the cortex and the other is medulla.

1. A is True and R is False.
2. A is False and R is True.
3. Both A and R are True.
4. Both A and R are False.

Options

• (1)

• (2)

• (3)

• (4)

Answer 1

(2)

Explanation:

The arrangement of gray and white matter is not the same in the brain and spinal cord. In the brain, gray matter is mainly on the outside and white matter is inside, while in the spinal cord, gray matter is inside and white matter is outside. Therefore, the Assertion (A) is false.

Grey matter mainly contains the cell bodies of neurons, whereas white matter mainly contains nerve fibres or axons. In the brain, the outer gray matter is called the cortex, while the inner white matter forms the medullary region. Therefore, the Reason (R) is true.

Hence, A is false and R is true.