Biology
Assertion. The arrangement of white and gray matter is the same in both brain and spinal cord.
Reason. 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.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Answer
A is False and R is True
Explanation
In the brain, the outer portion of cerebrum contains the gray matter and the inner portion of cerebrum contains the white matter. In the spinal cord, the arrangement is reversed. The gray matter lies on the inner side and the white matter on the outer side.
Related Questions
Assertion. The cerebellum is the largest portion of the brain.
Reason. Cerebellum is located just at the base of the cerebrum. It maintains body balance. Cerebrum is the seat of intelligence, consciousness and will power.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. The protective membranous covering of the brain and spinal cord are the same, whereas the bony coverings of these are cranium and vertebral column respectively.
Reason. Since both are very delicate and sensitive organs of our body, they are protected by a three-layered membrane known as meninges.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. The sympathetic nervous system is stimulated by the hormone thyroxine which is secreted by the thyroid gland.
Reason. Sympathetic nervous system prepares the body for violent action against abnormal conditions. Adrenaline is termed as emergency hormone.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Assertion. Reflexes are involuntary but all involuntary actions are not reflexes.
Reason. Reflexes and involuntary actions of our body are controlled by medulla oblongata and spinal cord respectively.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.