Question

Assertion – The presence of connective tissue inside the brain is essential for the conduction of nerve impulses.
Reason – Connective tissue holds together the nerve cells of the brain.
A. If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
B. If both the assertion and the reason are true but the reason is not the correct explanation of the assertion.
C. If the assertion is true but the reason is false.
D. If both the assertion and reason are false.

Answer 1

Hint: Connective tissue is the most common type of tissue in the human body. It connects the various structures and organs in our bodies. Connective tissues are associated with immunity, conduction of the nutrition, and framework and support.

Complete answer: Let us look at the assertion and the reason statements that are given to us one by one.
Assertion – The presence of connective tissue inside the brain is essential for the conduction of nerve impulses.
This statement is incorrect. This is because the connective tissue is absent in the central nervous system of the body, i.e., the brain and the spinal cord. As it is absent in the brain, hence, it has no role in the conduction of the nerve impulses. The nerve impulses are conducted by the neurotransmitters that are present inside the synaptic vesicles of the synaptic knobs of the axoplasm. Therefore, this statement is false.
Reason – Connective tissue holds together the nerve cells of the brain.
This statement is not correct. This is because the nerve cells of the brain and the spinal cord are held together by the supporting cells that are known as the neuroglia cells. Neuroglia cells are the type of cells that act like glue to hold the neurons together. Apart from that, they perform several house-keeping functions as well. Therefore, this statement is false.
Thus, based on the above information we can conclude that both the Assertion and the Reason statement are false.
Hence, the correct answer is option (D).

Note: The neuroglial cells are of several types depending upon the functions they perform –
a. Astrocytes – They provide nutritional support to neurons.
b. Microglia – They consume waste products. They are phagocytic in nature or scavenger cells.
c. Oligodendrocytes – They insulate the neurons by forming the myelin sheath.