Q. No.The sensory neuron enters the spinal cord through:
| 1. | The dorsal root of the spinal nerve |
| 2. | The ventral root of the spinal nerve |
| 3. | Either dorsal or ventral root depending on the point of origin |
| 4. | Both dorsal and ventral roots of the spinal nerves |
Destruction of the anterior horn cells of the spinal cord would result in loss of
(1) sensory impulses
(2) voluntary motor impulses
(3) commissural impulses
(4) integrating impulses
A frog has its brain crushed. But when pinched on the leg. The leg draws away. It is an
example of
1. neurotransmitter induced responsce
2. simple reflex
3. conditioned reflex
4. automated motor response.
One common example of simplex reflex is
(1) tying your shoe laces while talking to another person and not looking at them
(2) watering of mouth at the sight of a favourite food
(3) climbing up a stairs in dark without stumbling
(4) closing of eyes when strong light is flashed across them.
Assertion : All motor neurons are efferent neurons.
Reason : Motor neurons conduct nerve impulses from the spinal cord to the brain.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Reflex action does not involve
1. Conscious thought
2. PNS
3. Involuntary response
4. Both B and C
The ……. receive signals from …….and transmit it via …….nerve root
1. Afferent neurons, sensory organs, dorsal
2. Afferent neurons, effector organs, ventral
3. Efferent neurons, sensory organs, ventral
4. Efferent neurons, effector organs, dorsal
Which of the following is a reflex action?
| 1. | Sudden withdrawal of body part, when it comes in contact of hot body. |
| 2. | Knee jerk reflex. |
| 3. | Controlling sleep pattern. |
| 4. | More than one options are correct. |
Consider the following statements.
(a) Occurs involuntarily and without conscious effort.
(b) At least no afferent and two efferent neuron required.
(c) Only motor neuron is involved in the action.
(d) Polysynaptic and conditional reflex.
(e) Regulated by the spinal cord.
Which of the above statements are correct for the reflex shown in the above figure?
1. a and e
2. b, c and d
3. a, b, d and e
4. a, b, c, d and e
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