This set of Life Sciences Multiple Choice Questions & Answers (MCQs) focuses on “Nervous System”.
1. System of the body which coordinates and controls its activity is known as ___________
a) Organ system
b) Muscular system
c) Nervous tissue
d) Nervous system
View Answer
Explanation: Nervous system is the one which is responsible for all the activities of the body. It coordinates and controls the activities of the animal.
2. Peripheral nervous system consists of the brain and spinal cord.
a) True
b) False
View Answer
Explanation: Nervous system has two subdivisions, i.e., CNS and PNS. CNS or central nervous system consists of the brain and spinal cord while PNS or peripheral nervous system includes all nervous tissues outside the CNS.
3. Which of the following is NOT the component of the PNS?
a) Elastic connective tissue
b) Cranial nerves
c) Spinal nerves
d) Ganglia
View Answer
Explanation: Peripheral nervous tissue consists of all nervous tissue outside the central nervous system. The main components of PNS are spinal nerves and their branches, cranial nerves and their branches, sensory receptors, and ganglia.
4. Name the basic structural and functional unit of the nervous system.
a) Neuroglia
b) Glial cells
c) Neurons
d) Perikaryon
View Answer
Explanation: Nervous system has been composed of two types of cells, i.e., neurons and neuroglia. Neurons are the basic functional and structural unit of the nervous system.
5. Which of the following cells supports, nourishes, and protect the neurons?
a) Nissl bodies
b) Perikaryon
c) Ganglia
d) Glial cells
View Answer
Explanation: Glial cells (glia = glue)are also called neuroglia, these cells support, nourishes, and protect the neurons while ganglia are the cluster of cell bodies which found in the PNS.
6. What is the speed of nerve impulse?
a) 60 m/s
b) 0.5 – 130 m/s
c) 10-30 m/s
d) 50 -150 m/s
View Answer
Explanation: Nerve impulse or action potential is the electrical signals which travel through the membrane of the neurons. The speed of these signals ranges from 0.5 to 130 m/s.
7. What are Nissl bodies?
a) Golgi bodies
b) Lysosomes
c) Cluster of rough endoplasmic reticulum
d) Mitochondria
View Answer
Explanation: Neurons are made up of three parts, i.e., cell body, dendrites, and axon. The cell body consists of ribosomes and a cluster of endoplasmic reticulum, which is known as Nissl bodies.
8. Which of the following is NOT found in axon?
a) Endoplasmic reticulum
b) Neurofibrils
c) Mitochondria
d) Microtubules
View Answer
Explanation: Endoplasmic reticulum is not present in axons as it does not synthesize protein. An axon contains mitochondria, neurofibril, and microtubule and the cytoplasm of an axon is called axoplasm.
9. Name the multipolar neuron which is located entirely within the central nervous system.
a) Motor neuron
b) Efferent neuron
c) Afferent neuron
d) Interneuron
View Answer
Explanation: Interneurons are the multipolar neurons, which are found within the CNS. Motor neurons are also known as efferent neurons, they transfer signals from the CNS to effector organs.
10. Out of the following, which one does not affect the speed of conduction of nerve impulse.
a) No. of ganglia
b) Myelin sheath
c) Axon diameter
d) Temperature
View Answer
Explanation: The speed of conduction of nerve impulse depends upon three factors, i.e., myelin sheath, temperature, and axon diameter. Higher the temperature higher would be the speed and also larger the diameter higher the speed.
Sanfoundry Global Education & Learning Series – Life Sciences.
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