Question

Largest part of the brain is:
(A) Olfactory lobe
(B) Cerebral hemisphere
(C) Corpus callosum
(D) Optic nerve

Answer 1

The brain is one of the largest and most important and complex structures. It is associated with several important sensory functions such as information processing, nervous and motor responses etc. The brain is divided into three important parts which are the cerebrum, the cerebellum and the brain stem.

Complete answer:
The brain along with the spinal cord comprises the central nervous system. In the process of development in living organisms, the brain can be divided into three parts. The three parts are the forebrain, also known as the prosencephalon, midbrain or the mesencephalon and the hindbrain or the rhombencephalon. The different parts of the brain give rise to distinct structures such as the cerebrum, cerebellum and the brain stem.
The olfactory lobes are the tiny extensions of the brain that connects to the limbic system.
The cerebrum hemisphere is considered to be the largest part of the brain and it consists of two cerebral hemispheres with four lobes: frontal lobe, parietal lobe, occipital lobe and temporal lobe.
Corpus callosum is a white matter bridge linking two cerebral hemispheres.
The optic nerve comprises cell fibers in the ganglion from the inner part of the retina and transmits an impulse to the brain.

Therefore, the option (B) is the correct choice.

Additional Information:
Cerebrum consists of right and left hemispheres, is the main portion of the brain. Each cerebral hemisphere has a grey outer layer, known as the brain cortex and which is protected by a white inner layer. It helps in the higher functions such as touch perception, vision and hearing, voice, thinking, emotions, learning and good movement control. Under the cerebrum, the cerebellum is situated.
Telencephalon is the source of the cerebral hemispheres. The invagination of the walls occurs five weeks after conception. The hemispheres widen in a C-form and again draw with them all internal structures (like ventricles) into the hemisphere. The Monro foramina enables communication with the lateral ventricles. The plexus choroid is made up of ependymal and vascular mesenchymal cells.

Note: Cerebrum is the most important and largest part of the brain and consists of two hemispheres, right and left. It performs a wide variety of roles. It is also the most developed portion of the brain and consists of the major lobes. It is also known as the telencephalon. It consists of the cerebral cortex and other areas such as the basal ganglia, hippocampus and olfactory lobes. It is situated close to the cerebellum. The cerebrum develops from the prosencephalon.