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Nervous System

📆 November 5, 2024

Total Questions: 39

1. Which of the following plays an important role in regulating the amount of light entering into the eye? [S.S.C. JE Electrical Exam 28.01.2020 (Shift-I)]

Correct Answer: (b) Pupil
Solution:The function of controlling the amount of light entering the eye is done by the pupil. The cornea is a transparent bulging structure in the eye through which light enters, while the iris controls the size of the pupil. Eye color is determined by the iris.

2. The transparent front part of the eye is called: [S.S.C. JE Mechanical Exam 27.01.2020 (Shift-I)]

Correct Answer: (d) Cornea
Solution:The cornea is the transparent part of the eye that covers the front portion of the eye. It covers the pupil (the opening at the center of the eye), iris (the colored part of the eye), and the anterior chamber (the fluid-filled inside of the eye). The cornea’s main function is to refract, or bend, light.

3. Which of the following birds has a large number of rods and fewer cones on its retina? [S.S.C. JE Mechanical Exam 27.01.2020 (Shift-II)]

Correct Answer: (d) Owl
Solution:Owls have more rods and fewer cones on their retina. Rods and cones are light-sensitive cells. It is the function of cone cells to see in daylight and to provide color vision, while rod cells function to provide scotopic (or dark-adapted) vision. Rod cells are more sensitive to dim light or night vision. That is why owls (due to the presence of more rod cells in the retina) cannot see well during the day.

4. Which of the following is an example of unstriated muscles? [S.S.C. JE Mechanical Exam 22.03.2021 (Shift-I)]

Correct Answer: (a) Muscles of the iris in the eye
Solution:The muscles of the iris are an example of unstriated muscles. Unstriated muscles are the muscles which do not have striations. They look smooth, so they are also known as smooth muscles. These are involuntary muscles and are controlled by the autonomic nervous system. These muscles are present in the eyes, reproductive system, and digestive system.

5. Which of the following minerals helps in maintaining a healthy retina, cell membrane, and protein structure of the eye? [S.S.C. JE Mechanical Exam 27.01.2020 (Shift-II)]

Correct Answer: (b) Zinc
Solution:Zinc is a mineral that helps maintain the health of the retina, cell membranes, and protein structure of the eye. Zinc allows vitamin A to travel from the liver to the retina to produce melanin. Melanin is a pigment that protects the eyes from UV light.

6. Which part of the brain plays an important role in motor control? [S.S.C. Online Graduate Level (T-1) 3.09.2016 (Shift-III)]

Correct Answer: (a) Cerebellum
Solution:The cerebellum is located behind the brain stem. While the frontal lobe controls movement, the cerebellum “fine-tunes” this movement. This area of the brain is responsible for fine motor movement, balance, and the brain’s ability to determine limb position. A stroke in this area of the brain can lead to paralysis or “jerky” muscle movements.

7. Which organ is responsible for movement and hand-eye coordination in the human body? [S.S.C. Online MTS (T-I) 16.08.2019 (Shift-II)]

Correct Answer: (b) Brain
Solution:The brain is responsible for movement and hand-eye coordination in the human body. The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger, and every process that regulates our body. Together, the brain and spinal cord that extends from it make up the central nervous system, or CNS.

8. Which part of the brain maintains posture and balance of the human body? [S.S.C. Online MTS (T-I) 8.08.2019 (Shift-I)]

Correct Answer: (b) Cerebellum
Solution:The part of the brain responsible for maintaining posture and equilibrium of the body is the Cerebellum. This part of the brain appears to be a separate structure, distinct from the rest of the brain. It is located right below the cerebrum, which is made of two hemispheres. It is called a "little brain." The cerebellum is also responsible for receiving information from the sensory organs, the spinal cord, and other parts of the brain. It also regulates motor learning and movement.

9. Identify the part of the brain that controls the maintenance of posture, balance, and equilibrium. [S.S.C. Online Graduate Level (T-I) 13.06.2019 (Shift-II)]

Correct Answer: (d) Cerebellum
Solution:The part of the brain responsible for maintaining posture and equilibrium of the body is the Cerebellum. This part of the brain appears to be a separate structure, distinct from the rest of the brain. It is located right below the cerebrum, which is made of two hemispheres. It is called a "little brain." The cerebellum is also responsible for receiving information from the sensory organs, the spinal cord, and other parts of the brain. It also regulates motor learning and movement.

10. Which part of the brain is responsible for triggering actions like thinking, intelligence, memory, and ability to learn? [S.S.C. Online CHSL (T-I) 21.01.2017 (Shift-III)]

Correct Answer: (c) Cerebrum
Solution:The cerebrum is part of the forebrain and accounts for about two-thirds of the entire brain. It controls most of the voluntary movements and functions such as thinking, intelligence, memory, and learning ability.
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