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Standard X
Biology
Types of Neurons
The following...
Question

The following is the scheme showing the path of reflex arc. Identify the different labellings A, B, C, D, E, F in the reflex arc.
67567_1fd48ca3fc884940aaa5cc65854ee05c.png

A
A - Stimulus, B - Effector, C - Sensory nerve, D - Motor Nerve, E - Receptor, F - Response
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B
A - Stimulus, B - Receptor, C - Sensory nerve, D - Motor Nerve, E - Effector, F - Response
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C
A - Stimulus, B - Effector, C - Motor nerve, D - Sensory Nerve, E - Receptor, F - Response
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D
A - Stimulus, B - Receptor, C - Motor nerve, D - Sensory Nerve, E - Effector, F - Response
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Solution

The correct option is B A - Stimulus, B - Receptor, C - Sensory nerve, D - Motor Nerve, E - Effector, F - Response
Reflex action is a spontaneous, rapid and predictable motor response to a stimulus. Option B is the correct answer. It depicts the reflex arc with correctly labelled A-F. A to C show the receiving of the stimuli whereas D-F shows the response to that particular stimuli.

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Q.

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.

(a) Stimulus : Receptor :: Impulse : ..............

(b) Cerebrum : Diencephalon :: Cerebellum : ................

(c) Receptor : Sensory nerve :: Motor nerve :...............

Q. Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
(a) Stimulus : Receptor :: Impulse: __________
(b) Cerebrum : Diencephalon :: Cerebellum: __________
(c) Receptor : Sensory nerve :: Motor nerve: __________
Q. Rearrange the following in the correct sequence pertaining to what is given within brackets at the end.
(a) Effector Sensory neuron Receptor Motor neuron Stimulus Central nervous system Response (Reflex arc)
(b) Repolarisation Depolarisation Resting (polarised) (during conduction of nerve impulse through a nerve fibre)
(c) Axon endings Nucleus Dendrites Axon Perikaryon Dendron (Neuron structure)
(d) Diencephalon Cerebellum Medulla oblongata Pons Cerebrum mid brain (sequence of parts of human brain).
Q. Which of the following statements are true?
(i) Sudden reaction in response to the stimulus is called reflex action.
(ii) Sensory neurons carry signals from the spinal cord to muscles.
(iii) Motor neurons carry signals from receptors to spinal cord.
(iv) Reflex arc is the process in which the nerve impulse is carried and the response is generated.
Q.

Identify the incorrect statement(s).

I. The nerves carrying impulses from CNS to the peripheral system are Sensory nerves or Afferent nerves

II. The nerves carrying impulses from the peripheral system to CNS are Motor nerves or Efferent nerves

III. Sensory system coordinates auditory, visual, touch receptors etc.

IV. Motor system coordinates impulses towards effector organs.


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