Reflex action has all of the following features, except:
1.
Receiving of signal from a sensory organ
2.
Transmission of impulsive into the central nervous system through effector organ
3.
Carrying of signal from the central nervous system to the effector
4.
Response to an involuntary peripheral nervous stimulation
Subtopic: Â Nervous System |
From NCERT
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Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II | ||
| (a) | Multipolar neuron | (i) | Somatic neural system |
| (b) | Bipolar neuron | (ii) | Cerebral cortex |
| (c) | Myelinated nerve fibre | (iii) | Retina of Eye |
| (d) | Unmyelinated nerve fibre | (iv) | Spinal nerves |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (i) | (iv) | (ii) |
| 2. | (ii) | (iv) | (iii) | (i) |
| 3. | (ii) | (iii) | (i) | (iv) |
| 4. | (ii) | (iii) | (iv) | (i) |
Subtopic: Â Neuroanatomy |
 67%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II |
| A. Peripheral neural system | P. Comprises of all nerves associated with brain and spinal cord |
| B. Somatic neural system | Q. Relays impulses from CNS to skeletal muscles |
| C. Visceral neural system | R. Transmits impulse from CNS to involuntary organs and smooth muscles |
| D. Autonomic neural system | S. Part of PNS where impulses travel from CNS to the viscera and from the viscera to the CNS |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | R | S | P |
| 3. | R | S | P | Q |
| 4. | S | P | Q | R |
Subtopic: Â Nervous System |Â Autonomic Nervous System (OLD NCERT) |
 66%
From NCERT
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Sympathetic and parasympathetic neural systems are divisions of:
| 1. CNS | 2. Somatic neural system |
| 3. Autonomic neural system | 4. Visceral neural system |
Subtopic: Â Autonomic Nervous System (OLD NCERT) |
 88%
From NCERT
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In a neuron, Nissl’s granules are seen in:
| I. Cell body | II. Dendrites | III. Axon |
| 1. I and II only | 2. I and III only |
| 3. II and III only | 4. I, II and III |
Subtopic: Â Nervous System |
 89%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Code:
| Column I | Column II | ||
| A. | Multipolar neuron | P. | Embryonic stage |
| B. | Bipolar neuron | Q. | Retina |
| C. | Unipolar neuron | R. | Cerebral cortex |
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | R | P |
| 3. | R | Q | P |
| 4. | R | P | Q |
Subtopic: Â Nervous System |
 91%
From NCERT
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Consider the given statements:
I: Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
II: Unmyelinated nerve fibre is not enclosed by a Schwann cell or a myelin sheath.
III: Myelinated nerve fibres are found in spinal and cranial nerves.
IV: Unmyelinated nerve fibres are commonly found in autonomous and somatic neural systems.
I: Myelinated nerve fibres are enveloped with Schwann cells, which form a myelin sheath around the axon.
II: Unmyelinated nerve fibre is not enclosed by a Schwann cell or a myelin sheath.
III: Myelinated nerve fibres are found in spinal and cranial nerves.
IV: Unmyelinated nerve fibres are commonly found in autonomous and somatic neural systems.
| 1. Only II is incorrect | 2. I and II are correct |
| 3. III and IV are incorrect | 4. All are correct |
Subtopic: Â Nervous System |
 66%
From NCERT
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):
In the light of the above statements choose the correct answer from the options given below:
| Assertion (A): | Neurons are excitable cells. |
| Reason (R): | Their membranes are in a polarised state. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 87%
From NCERT
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When the neuron is not conducting any impulse, i.e., resting, the axonal membrane:
| 1. | is comparatively more permeable to sodium ions and nearly impermeable to potassium ions. |
| 2. | is freely permeable to sodium ions and potassium ions. |
| 3. | is impermeable to sodium ions and potassium ions. |
| 4. | is comparatively more permeable to potassium ions and nearly impermeable to sodium ions. |
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 88%
From NCERT
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The resting axonal membrane is impermeable to:
I: Sodium ions
II: Potassium ions
III: Negatively charges proteins present in the axoplasm
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Â Origin of Resting Membrane Potential |Â Action Potential |
 83%
From NCERT
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