MCQOPTIONS
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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.
| 901. |
Which of the following parts of a cell is non-living [CPMT 1993] |
| A. | Centriole |
| B. | Vacuole |
| C. | Ribosomes |
| D. | Mitochondria |
| Answer» C. Ribosomes | |
| 902. |
Who classified bacteria under Schizomycetes [MP PMT 2000] |
| A. | Nageli |
| B. | Linnaeus |
| C. | Leeuwenhoek |
| D. | Sadashivan |
| Answer» B. Linnaeus | |
| 903. |
Assertion : Human ancestors never used their tails and so the tails expressing gene has disappeared in them. Reason : Lamarck?s theory of evolution is popularly called theory continuity of germ plasm. [AIIMS 2005] |
| A. | If both the assertion and the reason are true and the reason is a correct explanation of the assertion |
| B. | If both the assertion and reason are true but the reason is not a correct explanation of the assertion |
| C. | If the assertion is true but the reason is false |
| D. | If both the assertion and reason are false |
| E. | If the assertion is false but reason is true |
| Answer» E. If the assertion is false but reason is true | |
| 904. |
Buds occurring on the nodes outside the leaf bases are |
| A. | Axillary |
| B. | Extra-axillary |
| C. | Terminal |
| D. | Cauline |
| Answer» C. Terminal | |
| 905. |
The chief advantage of encystment to Amoeba proteus is: |
| A. | an ability to live for a time without ingesting food. |
| B. | the cessation of most metabolic activity so that available energy may be used for reproduction. |
| C. | the opportunity to get rid of accumulated waste products. |
| D. | the ability to survive during unfavourable physical conditions. |
| Answer» E. | |
| 906. |
A chemical that prevents blood clotting is most useful in the treatment of: |
| A. | Leukemia |
| B. | Anaemia |
| C. | Coronary thrombosis |
| D. | Haemophilia |
| Answer» D. Haemophilia | |
| 907. |
In soil, the water available for root absorption is: |
| A. | Gravitational water |
| B. | Capillary water |
| C. | Hygroscopic water |
| D. | Combined water |
| Answer» C. Hygroscopic water | |
| 908. |
CAM plants differ from \[{{C}_{4}}\] plants in that: |
| A. | Carbon dioxide is stored as malic acid. |
| B. | Photosynthesis can occur at night in these plants. |
| C. | Their stomata close during periods that favour photorespiration. |
| D. | They use PEP carboxylase to fix carbon dioxide. |
| Answer» B. Photosynthesis can occur at night in these plants. | |
| 909. |
In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order [CBSE PMT 2004] |
| A. | Cell division, cell enlargement, cellmaturation, root cap |
| B. | Cell division, cell maturation, cell enlargement, root cap |
| C. | Root cap, cell division, cell enlargement, cell maturation |
| D. | Root cap, cell division, cell maturation, cell enlargement |
| Answer» D. Root cap, cell division, cell maturation, cell enlargement | |
| 910. |
Which of the following are required for blood clotting in mammals? |
| A. | \[{{K}^{+}}\] and vitamin K |
| B. | \[C{{a}^{+}}\] and vitamin A |
| C. | \[C{{a}^{2+}}\] and vitamin K |
| D. | \[{{K}^{+}}\] and vitamin E |
| Answer» D. \[{{K}^{+}}\] and vitamin E | |
| 911. |
Photosynthesis cannot continue for long if during light reaction, only cyclic photophosphorylation takes place. This is because: |
| A. | Photosystem I stops getting excited at a wavelength of light beyond 680 nm. |
| B. | Only ATP is formed, NADPH + \[{{H}^{+}}\] is not formed. |
| C. | There is no evolution of \[{{O}_{2.}}\] |
| D. | There is unidirectional cyclic movement of the electrons. |
| Answer» C. There is no evolution of \[{{O}_{2.}}\] | |
| 912. |
Collenchymatous tissue is found in [CBSE PMT 1990] |
| A. | Climbing plants |
| B. | Aquatic plants |
| C. | Woody climbers |
| D. | Herbaceous climbers |
| Answer» B. Aquatic plants | |
| 913. |
One of the following is sex-influenced character |
| A. | Appearence of beard |
| B. | Baldness in male |
| C. | Docile behaviour of female |
| D. | Low BMR in female |
| Answer» C. Docile behaviour of female | |
| 914. |
Which one is odd [CPMT 1993] |
| A. | Allium cepa |
| B. | Helianthus annuus |
| C. | Brassica juncea |
| D. | Arachis hypogea |
| Answer» B. Helianthus annuus | |
| 915. |
Eye of potato is [CBSE PMT 2001] |
| A. | Apical bud |
| B. | Axillary bud |
| C. | Accessory bud |
| D. | Adventitious bud |
| Answer» C. Accessory bud | |
| 916. |
Haversian canal are found in [BVP 2004] |
| A. | Internal ear of mammal |
| B. | External ear of mammal |
| C. | Long bone of rabbit |
| D. | Spinal chord |
| Answer» D. Spinal chord | |
| 917. |
The stimulus for geotropism in roots is perceived by: |
| A. | Root cap |
| B. | Quiescent centre |
| C. | Root tip |
| D. | None of the above |
| Answer» B. Quiescent centre | |
| 918. |
If a biochemical analysis of mitochondria is to be done, the best procedure would be [AIIMS 1984; BHU 1984] |
| A. | Grind the cell and filter out the mixture and take the debris |
| B. | Subject the cells to cell differentiation (centrifuge) and obtain mitochondria |
| C. | Select cells which have a large number of mitochondria |
| D. | Plasmolyse the cell, filter it and take the debris |
| Answer» C. Select cells which have a large number of mitochondria | |
| 919. |
All the synthesis reactions in the body form a division of metabolism called |
| A. | Anabolism |
| B. | Catabolism |
| C. | Chemical reaction |
| D. | None of these |
| Answer» B. Catabolism | |
| 920. |
Read carefully the following statements about pteridophytes. (i) They are used for medicinal purposes. (ii) They are frequently grown as ornaments. (iii) They are called vascular cryptogams. (iv)The produce spores rather than seeds. (v) They are used as soil binders. Which of the statements given above are correct? |
| A. | (i), (ii) and (v) |
| B. | (ii), (iv) and (v) |
| C. | (ii), (iii), (iv) and (v) |
| D. | All of the above |
| Answer» E. | |
| 921. |
Plants are always herbs in [CPMT 1991] |
| A. | Fabaceae |
| B. | Solanaceae |
| C. | Brassicaceae |
| D. | None of these |
| Answer» D. None of these | |
| 922. |
The resting membrane potential for neuron A is -70m V, while the resting potential for neuron B is -50m V. The threshold voltage for the production of an action potential is -35mV for both neurons. Which of the following statements is incorrect? |
| A. | Neuron A must depolarise by 35mV to reach the threshold voltage. |
| B. | Neuron B must hyperpolarise by 15mV to reach the threshold voltage. |
| C. | The inside of bothneurons is negatively charged with respect to the outside. |
| D. | A single EPSP received by neuron A would cause it to depolarise slightly. |
| Answer» C. The inside of bothneurons is negatively charged with respect to the outside. | |
| 923. |
Which of the following statements is correct regarding a myelinated nerve fibre? (i) It is always associated with an axon. (ii) It allows rapid conduction of nerve impulses. (iii) It allows slow conduction of nerve impulses. (iv) It has nodes of Ranvier. |
| A. | Only (i) and (ii) |
| B. | Only (i), (ii), and (iii) |
| C. | Only (i), (ii), and (iv) |
| D. | Only (i), (iii), and (iv) |
| Answer» D. Only (i), (iii), and (iv) | |
| 924. |
Sequence of meninges from inner to outside is: |
| A. | Duramater - Arachnoid - Piamater |
| B. | Duramater - Piamater - Arachnoid |
| C. | Arachnoid - Duramater - Piamater |
| D. | Piamater - Arachnoid - DuramaterI |
| Answer» E. | |
| 925. |
Once the threshold level is reached, ___. |
| A. | The \[N{{a}^{+}}\] gates open. |
| B. | An action potential will be generated. |
| C. | The membrane is depolarised. |
| D. | The refractory period is over. |
| Answer» C. The membrane is depolarised. | |
| 926. |
Clusters of neuron cell bodies embedded in the white matter of the brain are referred to as: |
| A. | Nuclei |
| B. | Gyri |
| C. | Suici |
| D. | Ganglia |
| Answer» B. Gyri | |
| 927. |
The function of cerebrospinal fluid does not include: |
| A. | Protection of delicate brain and spinal cord from shock. |
| B. | Protection of brain and spinal cord by containing antibody. |
| C. | Buoyancy to brain. |
| D. | As a medium for excretion of waste product. |
| Answer» C. Buoyancy to brain. | |
| 928. |
Which has H - shaped grey matter? |
| A. | Cerebrum |
| B. | Medulla oblongata |
| C. | Cerebellum |
| D. | Spinal cord |
| Answer» E. | |
| 929. |
In mammalian cochlea, the thin-walled sloping roof of the scala media is referred to as: |
| A. | Organ of Corti |
| B. | Scala tympani |
| C. | Basilar membrane |
| D. | Reissner's membrane |
| Answer» E. | |
| 930. |
Which is not connected with autonomic system? |
| A. | Memory & learning |
| B. | Peristalsis |
| C. | Digestion |
| D. | Excretion |
| Answer» B. Peristalsis | |
| 931. |
Which of the following statement is correct regarding cerebellum of brain? |
| A. | It is concerned with the maintenance of posture/equilibrium. |
| B. | It is responsible for olfactory functions. |
| C. | It controls optic functions. |
| D. | Both [a] and [c] |
| Answer» E. | |
| 932. |
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. | |
| 933. |
Which of the following statements is correct about rods compared to cones? (i) Rods are most numerous in the fovea. (ii) Rods contain rhodopsin. (iii) Rods produce general outlines of objects rather than sharp images. (iv) Rods produce black and white but not colour images. |
| A. | (i), and (ii) |
| B. | (ii), and (iii) |
| C. | (i),(ii) and (iii) |
| D. | (ii), (iii) and (iv) |
| Answer» E. | |
| 934. |
Match the column-I with column-II and select the correct option. Column-I Column-II A. Unipolar neuron I. In cerebral cortex B. Bipolar neuron II. In embryonic stage C. Multipolar neuron III. In retina of eye |
| A. | A- I; B-II; C-III |
| B. | A-I; B-III; C-II |
| C. | A-II; B-I; C-III |
| D. | A-II; B-III; C-I |
| Answer» E. | |
| 935. |
Which of the following is devoid of blood supply? |
| A. | Retina |
| B. | Choroid |
| C. | Cornea |
| D. | Scleroid |
| Answer» D. Scleroid | |
| 936. |
Which of the following options correctly represents the name of 1, 2, 3 and 4 in the given diagram of neuron? |
| A. | 1- Axon, 2- Dendrites, 3- Node of Ranvier, 4- Myelin sheath |
| B. | 1- Dendrites, 2- Axon, 3- Node of Ranvier, 4- Myelin sheath |
| C. | 1 - Dendrites, 2- Cell body, 3- Myelin sheath, 4- Node of Ranvier |
| D. | 1 - Axon, 2- Cell body, 3- Dendrites, 4-Node of Ranvier |
| Answer» D. 1 - Axon, 2- Cell body, 3- Dendrites, 4-Node of Ranvier | |
| 937. |
Brain waves common to a healthy sleeping person and a brain-damaged awake person are called: |
| A. | Alpha waves |
| B. | Beta waves |
| C. | Theta waves |
| D. | Delta waves |
| Answer» E. | |
| 938. |
In a nerve, if sodium pump is blocked, which of the following is most likely to happen? |
| A. | \[N{{a}^{+}}\] and \[{{K}^{+}}\] will increase outside the cell. |
| B. | \[N{{a}^{+}}\] outside the nerve will increase. |
| C. | \[N{{a}^{+}}\] inside the nerve will increase. |
| D. | \[{{K}^{+}}\] inside the nerve will increase. |
| Answer» D. \[{{K}^{+}}\] inside the nerve will increase. | |
| 939. |
Reflex arcs, which involve no processing in the brain, are beneficial because they permit: |
| A. | Instantaneous signaling to motor neurons. |
| B. | Avoidance of dangerous stimuli, even without a previously "learned" response. |
| C. | Immediate response to dangerous stimuli. |
| D. | All of the above |
| Answer» E. | |
| 940. |
The pinna of the ear is composed of: |
| A. | Elastic cartilage |
| B. | Hyaline cartilage |
| C. | White fibrocartilage |
| D. | Bone |
| Answer» B. Hyaline cartilage | |
| 941. |
Find out the right matching from the following pairs. |
| A. | Accommodation.................. Pupil |
| B. | Colour perception.................. Cones |
| C. | Night blindness.................. Rods |
| D. | Binocular vision.................. Iris |
| Answer» C. Night blindness.................. Rods | |
| 942. |
Which is activated in stress condition? |
| A. | Somatic |
| B. | Sympathetic |
| C. | Parasympathetic |
| D. | Whole ANS |
| Answer» C. Parasympathetic | |
| 943. |
The enzyme required for the conduction of nerve impulse across synapse is: |
| A. | Peroxidase |
| B. | Choline acetylase |
| C. | Ascorbic acid oxidase |
| D. | Succinic dehydrogenase |
| Answer» C. Ascorbic acid oxidase | |
| 944. |
Ear is most sensitive to sound waves of: |
| A. | 1000 cycles/sec |
| B. | 10000 cycles/sec |
| C. | 6000 cycles/sec |
| D. | 20 cycles/sec. |
| Answer» B. 10000 cycles/sec | |
| 945. |
The neural phenomenon depicted by the given diagram is best described as: |
| A. | Spatial summation |
| B. | Temporal summation |
| C. | Presynaptic excitation |
| D. | Presynaptic inhibition |
| Answer» B. Temporal summation | |
| 946. |
Eye muscles are innervated by: |
| A. | Oculomotor, abducens and vagus |
| B. | Oculomotor, trochlear and abducens |
| C. | Oculomotor, abducens and facial |
| D. | Oculomotor, facial and vagus |
| Answer» C. Oculomotor, abducens and facial | |
| 947. |
Three layers in eye ball from inside out are: |
| A. | Retina, choroid, sclerotic |
| B. | Choroid, retina, sclerotic |
| C. | Sclerotic, choroid, retina |
| D. | Sclerotic, retina, choroid |
| Answer» B. Choroid, retina, sclerotic | |
| 948. |
Which of the following controls reflex action? |
| A. | Central nervous system |
| B. | Sympathetic nervous system |
| C. | Parasympathetic nervous system |
| D. | Sensory nerves |
| Answer» B. Sympathetic nervous system | |
| 949. |
Napiform roots are recorded from: |
| A. | Radish |
| B. | Carrot |
| C. | Beetroot |
| D. | Sweet potato |
| Answer» D. Sweet potato | |
| 950. |
Choose the correct option for 1, 2 and 3. |
| A. | 1 - zone of elongation, 2 - zone ofmeiosis, 3 - zone of mitosis |
| B. | 1 - zone of maturation, 2 - zone ofmeristematic activity, 3 - zone of elongation |
| C. | 1 - zone of mitosis, 2 - zone of elongation, 3 - zone of root cap |
| D. | 1 - region of maturation, 2 - region of elongation, 3 - meristematic activity |
| Answer» E. | |