Q1Written answer
The major parts of the human neural system are depicted below. Fill in the empty boxes with appropriate words.
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NCERT Exemplar · Class 11 · Biology
Chapter 21: Neural Control and Coordination
Practice each question, then open the answer or worked solution.
SHORT ANSWER TYPE QUESTIONS
6 questionsQ2Written answer
What is the difference between electrical transmission and chemical transmission?
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Electrical transmission occurs at the electrical synapse, and this will be the faster transmission. Electric current transfers directly from one neuron are in very close proximity. In chemical transmission, the transmission will be slower and occurs at a chemical synapse. The neurotransmitters are involved in the transmission of impulses at the synapses.
Q3Written answer
Neural system and computers share certain common features. Comment in five lines. (Hint: CPU, input-output devices).
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1. In computers, the input devices are the mouse and keyboard, while in the neural system, the sensory neurons act as input devices which take inputs from the environment.
2. The message from input devices is sent to the brain in a neural system and the CPU in computers.
3. The brain processes the information from the input devices, whereas the CPU processes the information and gives the command to the output device.
Q4Written answer
If someone receives a blow on the back of the neck, what would be the effect on the person’s CNS?
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If someone receives a blow on the back of the neck, it may lead to the dislocation of cervical vertebrae (located right below the skull).
Q5Written answer
What is the function ascribed to Eustachian tube?
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It helps in equalizing the pressure on either side of the eardrum. It is the tube that connects the middle ear cavity with the pharynx.
Q6Written answer
Label the following parts in the given diagram using the arrow
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