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MCQOPTIONS
This section includes 14620 Mcqs, each offering curated multiple-choice questions to sharpen your NEET knowledge and support exam preparation. Choose a topic below to get started.
| 13401. |
"X" is spiral shaped structure (given below) consisting of hair cells that serve as receptors for auditory stimuli. Identify "X" and its label & location (marked as 1, 2, 3 and 4) from the given diagrammatic representation of the sectional view of cochlea. |
| A. | X- Organ of corti, 2, 3. |
| B. | X- Eustachian tube, 1, 2. |
| C. | X- Semicircular canal, 3, 4. |
| D. | X- Crista ampullaris, 1, 4. |
| Answer» B. X- Eustachian tube, 1, 2. | |
| 13402. |
The human eye is sensitive only to light having wavelength ranging from: |
| A. | 80 to 280 nanometre |
| B. | 380 to 760 nanometre |
| C. | 780 to 870 nanometre |
| D. | 880 to 980 nanometre |
| Answer» C. 780 to 870 nanometre | |
| 13403. |
Which of the following disorder of eyes caused by UV radiations? |
| A. | Cataract |
| B. | Glaucoma |
| C. | Dilation pupil |
| D. | Some defect of retina |
| Answer» B. Glaucoma | |
| 13404. |
A circular canal which is found in limbus part of eyes is called: |
| A. | Hyaloid canal |
| B. | Canal of Schlemm |
| C. | Canal of Cloquet |
| D. | Eustachian tube |
| Answer» C. Canal of Cloquet | |
| 13405. |
Receptors which are sensitive to pain are known as: |
| A. | Rheoreceptor |
| B. | Algesireceptors |
| C. | Tangoreceptors |
| D. | Mechanoreceptors |
| Answer» C. Tangoreceptors | |
| 13406. |
The diagram shows the sequence of events occurring as an action potential arrives at a synapse. The numbered arrows represent the movement of substances across the membranes. What are the substances moving across the membranes? |
| A. | 12345\[{{K}^{+}}\]\[N{{a}^{+}}\]Ach.\[C{{a}^{2+}}\]\[{{K}^{+}}\] |
| B. | \[{{K}^{+}}\]\[N{{a}^{+}}\]\[{{K}^{+}}\]\[C{{a}^{2+}}\]Ach. |
| C. | \[N{{a}^{+}}\]\[{{K}^{+}}\]\[C{{a}^{2+}}\]Ach.\[N{{a}^{+}}\] |
| D. | \[N{{a}^{+}}\]\[{{K}^{+}}\]\[N{{a}^{+}}\]Ach.\[C{{a}^{2+}}\] |
| Answer» D. \[N{{a}^{+}}\]\[{{K}^{+}}\]\[N{{a}^{+}}\]Ach.\[C{{a}^{2+}}\] | |
| 13407. |
Which of the following is the largest nerve? |
| A. | Vagus |
| B. | Olfactory |
| C. | Trigeminal |
| D. | Glossopharyngeal |
| Answer» D. Glossopharyngeal | |
| 13408. |
Which of the following statement is correct regarding the organ of eye-sight? |
| A. | The space between cornea and lens is filled with transparent gel. |
| B. | When all cones are stimulated equally, sensation of no light (dark) is produced. |
| C. | Rhodopsin is purplish red protein, hence called visual purple. |
| D. | The anterior transparent portion of choroid is called cornea. |
| Answer» D. The anterior transparent portion of choroid is called cornea. | |
| 13409. |
Which of the following statements is false about the electrical synapse? (i) At electrical synapses, the membranes of pre and post synaptic neurons are in very close proximity. (ii) Electrical current can flow directly from one neuron into the other across the synapses. (iii) Transmission of an impulse across electrical synapses is very similar to impulse conduction along single axon. (iv) Electrical synapses pass electrical signal between cells with the use of acetylcholine (Ach). (v) Electrical synapses are fast rare in our system. |
| A. | (i) and (ii) |
| B. | Only (ii) |
| C. | Only (iv) |
| D. | Only (v) |
| Answer» D. Only (v) | |
| 13410. |
In static condition, the body balance is sensed by: |
| A. | Crista |
| B. | Macula |
| C. | Both [a] and [b] |
| D. | Cochlear canal |
| Answer» C. Both [a] and [b] | |
| 13411. |
The set of mixed nerve is: |
| A. | Optic, auditory, olfactory |
| B. | Auditory, trigeminal, hypoglossal |
| C. | Occulomotor, pathetic, abducens |
| D. | Vagus, facial, trigeminal |
| Answer» E. | |
| 13412. |
Nerve fibres are surrounded by an insulating fatty layer called: |
| A. | Adipose sheath |
| B. | Myelin sheath |
| C. | Hyaline sheath |
| D. | Peritoneum |
| Answer» C. Hyaline sheath | |
| 13413. |
Several nervous system diseases result from a loss of support cells or of substances produced by support cells (such as myelin). The primary function of these support cells is to: |
| A. | Act as supporting structures within nervous tissue. |
| B. | Produce insulating material around axons. |
| C. | Assist in the conduction of impulses along neurons. |
| D. | All of the above |
| Answer» E. | |
| 13414. |
In the given diagram of brain what does "1" represent? |
| A. | Pons |
| B. | Midbrain |
| C. | Cerebellum |
| D. | Medulla oblongata |
| Answer» D. Medulla oblongata | |
| 13415. |
Match the column-I (various phase of an action potential) with column-II (ionic activity associated) and choose the correct option. Column-I Column-II A. Resting stage of a neuron I. Opening and then closing of the B. Depolarisation phase in the generation of action potential. II. All voltage gated sodium and potassium channels are closed. C. Repolarisation phase in the generation of action potential III. The sodium channels remain opened. D. Absolute refractory phase. IV. Opening of potassium gates and the rushing of potassium |
| A. | A-II; B-I; C-IV; D-III |
| B. | A-I; B-II; C-III; D-IV |
| C. | A-III; B-IV; C-I; D-II |
| D. | A-IV; B-II; C-III; D-I |
| Answer» B. A-I; B-II; C-III; D-IV | |
| 13416. |
Dopamine acetylcholine and GABA are: |
| A. | Hormone |
| B. | Enzyme |
| C. | Synthetic vitamin |
| D. | Neurotransmitters |
| Answer» E. | |
| 13417. |
Four events in the transmission of nerve impulses across synapses are given below. (i) Depolarisation of the presynaptic membrane. (ii) Propagation of postsynaptic action potential. (iii) Hydrolysis of transmitter substance. (iv) Rupturing of synaptic vesicles. In which sequence do these events occur? |
| A. | (i)\[\to \](iii) \[\to \] (ii) \[\to \] (iv) |
| B. | (i)\[\to \](iv)\[\to \](ii) \[\to \] (iii) |
| C. | (iv)\[\to \](i)\[\to \](iii)\[\to \](ii) |
| D. | (iv)\[\to \](iii)\[\to \](i)\[\to \] (ii) |
| Answer» C. (iv)\[\to \](i)\[\to \](iii)\[\to \](ii) | |
| 13418. |
How are neurons structurally adapted to chemically transmit impulses to neighboring neurons? |
| A. | The trigger zone is near the cell body. |
| B. | Axon terminals contain neurotransmitter substances within synaptic vesicles. |
| C. | Schwann cells surround axons. |
| D. | They have numerous dendrites. |
| Answer» C. Schwann cells surround axons. | |
| 13419. |
The given diagram shows the axon terminal and synapse with few part labelled as 1, 2, 3 & 4. Choose the correct combination of labelling from the given options. |
| A. | 1-Synaptic vesicle, 2-Axon terminal, 3-Synaptic cleft, 4-Postsynaptic membrane |
| B. | 1-Axon terminal, 2-Synaptic vesicle, 3-Postsynaptic membrane, 4-Synaptic cleft. |
| C. | 1-Synaptic vesicle, 2-Synaptic cleft, 3-Axon terminal, 4-Post synaptic membrane |
| D. | 1 -Post synaptic membrane, 2-Axon terminal, 3-Synaptic vesicle, 4-Synaptic cleft |
| Answer» B. 1-Axon terminal, 2-Synaptic vesicle, 3-Postsynaptic membrane, 4-Synaptic cleft. | |
| 13420. |
The primary cause for the existence of resting membrane potential can be attributed to: |
| A. | Potassium diffusion potential |
| B. | Presence of electrogenic pump |
| C. | Diffusion potentials of \[N{{a}^{+}},{{K}^{+}}andC{{l}^{-}}\] |
| D. | Anions like proteins, phosphates and sulphates. |
| Answer» B. Presence of electrogenic pump | |
| 13421. |
In the given figure of synapse few structure are marked as 1, 2, 3, and 4. Study the figure carefully and identify the structure which transmits signal across a chemical synapse. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 13422. |
The accompanying diagram shows the structure of neuron. Identity 1 to 5. |
| A. | 12345Nerve fibreCyton or cell bodySchwann cellNode of RanvierSynaptic Knob |
| B. | DendritesCyton or cell bodySchwann cellNode of RanvierSynaptic Knob |
| C. | DendritesSchwann cellNode of RanvierSynaptic Knob |
| D. | DendritesCyton or cell bodyNerve cellNode of RanvierSynaptic Knob |
| Answer» C. DendritesSchwann cellNode of RanvierSynaptic Knob | |
| 13423. |
Eustachian tube connects: |
| A. | External ear with middle ear |
| B. | External ear with internal ear |
| C. | Middle ear with pharynx |
| D. | Internal pharyax |
| Answer» D. Internal pharyax | |
| 13424. |
Which of the following substances can cure Parkinson's disease? |
| A. | GABA |
| B. | Acetylcholine |
| C. | Dopamine |
| D. | Glutamic acid |
| Answer» D. Glutamic acid | |
| 13425. |
Which of the following functions as a signal filter and relays signals to the appropriate portion of the brain? |
| A. | Thalamus |
| B. | Hypothalamus |
| C. | Cerebrum |
| D. | Cerebellum |
| Answer» B. Hypothalamus | |
| 13426. |
Scala vestibuli is connected with: |
| A. | Fenestra rotundus |
| B. | Fenestra ovalis |
| C. | Scala media |
| D. | Eustachian tube |
| Answer» C. Scala media | |
| 13427. |
The one-way flow of information between presynaptic and postsynaptic cells is characteristic of most kinds of neuron interactions. A notable exception to this rule is the: |
| A. | Neuromuscular junction |
| B. | Nicotinic receptor system of vertebrate neurons |
| C. | Motor end plate |
| D. | Gap junction |
| Answer» E. | |
| 13428. |
Which is absent in aqueous humor? |
| A. | Carbon dioxide |
| B. | Oxygen |
| C. | Hyaluronic acid |
| D. | Glucose |
| Answer» D. Glucose | |
| 13429. |
The amount of neurotransmitter released from presynaptic cell is a function of: |
| A. | The voltage of the individual action potential in the presynaptic neuron. |
| B. | The frequency of arriving action potentials is the presynaptic neuron. |
| C. | Whether the action potential is excitatory or inhibitory. |
| D. | The receptors in the postsynaptic cell. |
| Answer» C. Whether the action potential is excitatory or inhibitory. | |
| 13430. |
Which of the following processes occurs during repolarisation of nerve fibre? (i) Open \[N{{a}^{+}}\] channel (ii) Closed \[N{{a}^{+}}\] channel (iii) Closed \[{{K}^{+}}\] channel (iv) Open \[{{K}^{+}}\] channel |
| A. | (ii) and (iv) |
| B. | (i) and (iii) |
| C. | (ii) and (iii) |
| D. | (i) and (ii) |
| Answer» B. (i) and (iii) | |
| 13431. |
An abnormal production of antidiuretic hormone (ADH) could result from a dysfunction of: |
| A. | Hypothalamus |
| B. | Choroid plexus |
| C. | Medulla oblongata |
| D. | Reticular activation system |
| Answer» B. Choroid plexus | |
| 13432. |
A bipolar neuron has: |
| A. | 2 dendrites and 1 axon |
| B. | 2 axons and 1 dendrite |
| C. | 1 dendrite and 1 axon |
| D. | 2 axons and 2 dendrites, |
| Answer» D. 2 axons and 2 dendrites, | |
| 13433. |
Vermis is a part of: |
| A. | Optic lobe |
| B. | Midbrain |
| C. | Cerebellum |
| D. | Medulla oblongata |
| Answer» D. Medulla oblongata | |
| 13434. |
Multicellular hairs are found on [MHCET 2004] |
| A. | Root |
| B. | Stem |
| C. | Both [a] and [b] |
| D. | None of the above |
| Answer» C. Both [a] and [b] | |
| 13435. |
A stem with distinct solid nodes and hollow internodes is |
| A. | Sobole |
| B. | Culm |
| C. | Scape |
| D. | Intercalary stem |
| Answer» C. Scape | |
| 13436. |
Phylloclade is found in [AMU 2001] |
| A. | Chrysanthemum |
| B. | Asparagus |
| C. | Ruscus |
| D. | Opuntia |
| Answer» E. | |
| 13437. |
Potato is multiplied vegetatively with the help of [BHU 1991] |
| A. | Corm |
| B. | Rhizome |
| C. | Tuber |
| D. | Phyllode |
| Answer» D. Phyllode | |
| 13438. |
Stem thorns help in |
| A. | Climbing |
| B. | Protection from grazing animals |
| C. | Reduction in rate of transpiration |
| D. | All of these |
| Answer» E. | |
| 13439. |
The bulb stores food in [BHU 1986] |
| A. | Enlarged roots |
| B. | Swollen leaf bases |
| C. | Swollen stem |
| D. | Inflorescence |
| Answer» C. Swollen stem | |
| 13440. |
Phylloclade of Opuntia is stem because |
| A. | It bears flowers and leaves |
| B. | It arises in the axil of leaf |
| C. | Only [b] is correct |
| D. | Both [a] and [b] are correct |
| Answer» E. | |
| 13441. |
Stem takes part in storage and perennation in [AMU 1994; DPMT 1994; AFMC 1994; Manipal 1997] |
| A. | Wheat |
| B. | Groundnut |
| C. | Radish |
| D. | Ginger |
| Answer» E. | |
| 13442. |
Offset occurs in |
| A. | Strawberry |
| B. | Colocasia |
| C. | Pistia |
| D. | Chrysanthemum |
| Answer» D. Chrysanthemum | |
| 13443. |
Function of stem is [Pondicherry 1983; AFMC 1984, 85, 86] |
| A. | To produce branches and leaves |
| B. | Storage of food |
| C. | Conduction of water and minerals |
| D. | All of these |
| Answer» E. | |
| 13444. |
An underground specialised shoot with reduced disc like stem covered by fleshy leaves is [APMEE 1996; JKCMEE 2000] |
| A. | Bulb |
| B. | Bulbil |
| C. | Rhizome |
| D. | Rhizophore |
| Answer» B. Bulbil | |
| 13445. |
Prickles of rose are: |
| A. | Modified leaves |
| B. | Modified stipules |
| C. | Exogenous in origin |
| D. | Endogenous in origin |
| Answer» D. Endogenous in origin | |
| 13446. |
Fibrous root system is found in: |
| A. | Monocotyledonous plants |
| B. | Dicotyledonous plants |
| C. | Bryophytes |
| D. | Gymnosperms |
| Answer» B. Dicotyledonous plants | |
| 13447. |
Most reduced form of stem is found in: |
| A. | Bulb |
| B. | Rhizome |
| C. | Tuber |
| D. | Corm |
| Answer» B. Rhizome | |
| 13448. |
Pneumatophores are found in: |
| A. | the vegetation which is found in marshy and saline lake. |
| B. | the vegetation which is found in saline soil. |
| C. | xerophytic condition. |
| D. | hydrophytic condition. |
| Answer» B. the vegetation which is found in saline soil. | |
| 13449. |
An edible inflorescence is: |
| A. | Brassica rapa |
| B. | Mustard |
| C. | Raphanus sativus |
| D. | Brassica oleracea |
| Answer» E. | |
| 13450. |
Select the statements which are not applicable to the family solanaceae?(i) Epipetalous and syngenesious anthers.(ii) Bicarpellary and syncarpous ovary.(iii) Oblique ovary with axile placentation.(iv) Stamen six, arranged in two whorls.(v) Bicarpellary, syncarpous and inferior ovary |
| A. | (ii) and (iii) |
| B. | (i), (iv) and (v) |
| C. | (ii), (iv) and (v) |
| D. | (i) and (iii) |
| Answer» C. (ii), (iv) and (v) | |