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.
| 10251. |
Broad spectrum antibiotic is that which [AMU 1985] |
| A. | Acts on both pathogens and hosts |
| B. | Acts on all bacteria and viruses |
| C. | Acts on a variety of pathogenic micro-organisms |
| D. | Is effective in very small amounts |
| Answer» D. Is effective in very small amounts | |
| 10252. |
In ultrasound, waves are produced by |
| A. | X-rays |
| B. | Piezoelectric effect |
| C. | Magnetic waves |
| D. | Sound effect |
| Answer» C. Magnetic waves | |
| 10253. |
'Pathogens' are |
| A. | Substances produced against any disease causative |
| B. | Chemical substances produced by the host cells to kill the parasite animal |
| C. | Disease spreading factors |
| D. | Cells which kill the parasites |
| Answer» D. Cells which kill the parasites | |
| 10254. |
Free living nitrogen fixing bacteria can bring about saving of nitrogen fertilizer to the tune of |
| A. | 10 - 25 kg/ha |
| B. | 30 - 50 kg/ha |
| C. | 20 - 30 kg/ha |
| D. | 50 - 60 kg/ha |
| Answer» B. 30 - 50 kg/ha | |
| 10255. |
Guarana is |
| A. | Fodder plant |
| B. | Oil plant |
| C. | Beverage plant |
| D. | Food plant |
| Answer» D. Food plant | |
| 10256. |
DDT is a [AMU 1986] |
| A. | Organochlorine |
| B. | Organophosphate |
| C. | Carbamate |
| D. | Triazine |
| Answer» B. Organophosphate | |
| 10257. |
Varieties developed by pureline method are |
| A. | Homozygous and not uniform |
| B. | Homozygous and uniform |
| C. | Heterozygous and not uniform |
| D. | Heterozygous and uniform |
| Answer» C. Heterozygous and not uniform | |
| 10258. |
'Social forestry' aims at [AIIMS 1996] |
| A. | Growing different types of plantations together |
| B. | Growing one type of trees on the land |
| C. | Management of forests by village bodies |
| D. | Management of forests by cooperative societies |
| Answer» D. Management of forests by cooperative societies | |
| 10259. |
If the number of a species increase in any national park it can be due to [CBSE PMT 1999] |
| A. | Intraspecific competition |
| B. | Interspecific competition |
| C. | Emigration |
| D. | Mutualism |
| Answer» B. Interspecific competition | |
| 10260. |
Which of the following pollutants affect more to organisms of the higher trophic level of a food chain due to biological amplification |
| A. | Sewage and plant fertilizers |
| B. | Detergents |
| C. | Heavy metals mercury salts and non- biodegradable phenolic chemicals |
| D. | Poisonous cynides |
| Answer» D. Poisonous cynides | |
| 10261. |
In India, temperate evergreen vegetation occurs mostly in [CPMT 1983, MP PMT 1990] |
| A. | Rajasthan and South Punjab |
| B. | Eastern and Western Himalayas less than 3500 m |
| C. | Western Himalayas above 3500 m |
| D. | Western Ghats and Assam |
| Answer» C. Western Himalayas above 3500 m | |
| 10262. |
The number of individuals in each trophic level depends upon |
| A. | The number of individuals at higher trophic level |
| B. | The number of individuals at the lower trophic level |
| C. | The number of food chains present |
| D. | The amount of sunlight available |
| Answer» C. The number of food chains present | |
| 10263. |
Which one of the following words has been used by Prof. R. Misra for ecosystem |
| A. | Biocoenosis |
| B. | Ecocosm |
| C. | Microcosm |
| D. | Biosystem |
| Answer» C. Microcosm | |
| 10264. |
Auxetic growth is one in which there is [CBSE PMT 1994] |
| A. | Increase in the fatty tissue only |
| B. | Increase in the cell volume only |
| C. | Increase in the cell number |
| D. | Increase in the volume of the body due to the decrease in the inter-cellular material |
| Answer» C. Increase in the cell number | |
| 10265. |
The correct order of the reproductive tract of a male human being is [DPMT 1992] |
| A. | Rete testis, epididymis, vasa efferentia, urethra |
| B. | Rete testis, vasa efferentia, epididymis, urethra |
| C. | Vasa efferentia, epididymis, urethra, rete testis |
| D. | Urethra, rete testis, epididymis, vasa efferentia |
| Answer» C. Vasa efferentia, epididymis, urethra, rete testis | |
| 10266. |
If a planter is interested in obtaining a good crop of tea leaves from a single plant, he should |
| A. | Feed auxin to the plant through soil |
| B. | Remove the apical bud of the main shoot and the branches |
| C. | Cut off the tip of the plant and then apply auxins to the cut end |
| D. | Supply auxin from the tip of the plant as well as through roots |
| Answer» C. Cut off the tip of the plant and then apply auxins to the cut end | |
| 10267. |
The most significant value of vegetative propagation is that |
| A. | It is a means of producing a large population of individuals genetically identical to the parent |
| B. | It ensures that the progeny are safe from attack of diseases and pests |
| C. | It is an ancient practice |
| D. | It enables rapid production of genetic variation |
| Answer» B. It ensures that the progeny are safe from attack of diseases and pests | |
| 10268. |
X- rays are used in [BHU 2003] |
| A. | ECG |
| B. | EEG |
| C. | CT -Scan |
| D. | Endoscopy |
| Answer» D. Endoscopy | |
| 10269. |
ELISA is used to detect viruses, where [CPMT 2004] |
| A. | Alkaline phosphatase is the key reagent |
| B. | Catalase is the key reagent |
| C. | DNA-probes are required |
| D. | Southern blotting is done |
| Answer» B. Catalase is the key reagent | |
| 10270. |
If the source is opposite to the direction of sun, then honey bee will convey the direction by [CPMT 1982] |
| A. | Clockwise round dance |
| B. | Upright down tail wagging dance |
| C. | Anticlockwise round dance |
| D. | Opposite to b |
| Answer» C. Anticlockwise round dance | |
| 10271. |
Biological control of agricultural pests, unlike the chemical control, is [CBSE PMT 1995] |
| A. | Toxic |
| B. | Polluting |
| C. | Very expensive |
| D. | Self-perpetuating |
| Answer» E. | |
| 10272. |
Majority of improved varieties of sugarcane are produced by crosses between Noble-cane and Cob-cane, which are respectively |
| A. | Saccharum robustum and S. spontaneum |
| B. | S. spontaneum and S. officinarum |
| C. | S. officinarum and S. robustum |
| D. | S. officinarum and S. spontaneum |
| Answer» E. | |
| 10273. |
At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation [CBSE PMT 2005] |
| A. | \[22\frac{1}{2}{}^\circ \] North and South |
| B. | \[40{}^\circ \]North and South |
| C. | \[42\frac{1}{2}{}^\circ \]North and South |
| D. | \[66{}^\circ \]North and South |
| Answer» C. \[42\frac{1}{2}{}^\circ \]North and South | |
| 10274. |
The species which are very few in number in the world are known as |
| A. | Living fossils |
| B. | Endangered |
| C. | Threatened |
| D. | Rare |
| Answer» E. | |
| 10275. |
When all parts except the leaves of a short day plant are covered with a light-proof cover and then subjected to short day light/dark treatment, it will produce flower buds. When a portion of this plant is grafted on to another plant of the same species which has been prevented from flowering by excessive exposure to light, this latter plant will also produce flower buds. Which is the best inference from this result |
| A. | Hormones can transmit information to all parts of plants |
| B. | Leaves are more sensitive to the photoperiodic stimulus than other parts of the plant |
| C. | The photoperiodic stimulus is received by the leaves and transmitted by a hormone |
| D. | The photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone |
| Answer» D. The photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone | |
| 10276. |
Fraternal twins in man are produced when [CMC Vellore 1993] |
| A. | Two sperms fertilize an ovum and the first two blastomeres separate from each other |
| B. | One sperm fertilizes an ovum and first two blastomeres separate from each other |
| C. | Egg develops parthenogenetically and first two blastomeres separate from each other |
| D. | Two ova are fertilized simultaneously |
| Answer» E. | |
| 10277. |
Which of the following four phases, in the post emergence life of an angiospermic plant, begins just after germination of seed and ends when the plant develops the capacity to reproduce [KCET 1999] |
| A. | Death |
| B. | Ageing |
| C. | Maturity |
| D. | Juvenility |
| Answer» E. | |
| 10278. |
Black lung disease is common among |
| A. | Coal miners |
| B. | Refinery workers |
| C. | Farmers |
| D. | Petrochemical industry workers |
| Answer» B. Refinery workers | |
| 10279. |
Which of the following insecticide is obtained from the roots of Derris elleptica [BHU 2004] |
| A. | Cinerin |
| B. | Nicotine |
| C. | Rotenone |
| D. | Pyrethrum |
| Answer» D. Pyrethrum | |
| 10280. |
In which the parthenogenesis is observed [CPMT 1975] |
| A. | Honey bee |
| B. | Silk worm |
| C. | Earth worm |
| D. | House fly |
| Answer» B. Silk worm | |
| 10281. |
Which one of the following pair is correctly matched to the wild life and national park [CBSE PMT 1996; MP PMT 2003] |
| A. | Rann of Kutch - Wild ass |
| B. | Gir forest - Tiger |
| C. | Manas - Elephant |
| D. | Corbett park - Asiatic lion |
| Answer» B. Gir forest - Tiger | |
| 10282. |
With increasing age, cell volume |
| A. | Increases |
| B. | Decreases |
| C. | Does not change |
| D. | None of the above |
| Answer» C. Does not change | |
| 10283. |
The region where sperm enters the egg is called [NCERT 1972; CPMT 1974; RPMT 2001, 02] |
| A. | Equator |
| B. | Receptor cone |
| C. | Animal pole |
| D. | Vegetal pole |
| Answer» C. Animal pole | |
| 10284. |
The relation of flowering to the lengths of light and dark period was investigated by two experiments. In one experiment, the plants were subjected to dark periods of various lengths while the light periods were kept at 4 hours. In the second experiment, plants were kept in dark periods of various lengths while the light periods were kept at 16 hours. The number of flowers formed in relation to these periods is shown in the tableDark periods hoursflowers formed in experimental light periods4 hours16 hours8001000124614571658 These results indicate that flowering |
| A. | Requires long days |
| B. | Is initiated by a long light period |
| C. | Is due to short light periods |
| D. | Requires a minimum dark period |
| Answer» E. | |
| 10285. |
Which of the following organisms is known to form abscesses in human liver, lungs, brain etc. [AIIMS 1993] |
| A. | Entamoeba histolytica |
| B. | Monocystis |
| C. | Plasmodium |
| D. | Fasciola hepatica |
| Answer» B. Monocystis | |
| 10286. |
A person is injected with globulin against hepatitis. This is [BVP 2004] |
| A. | Artificially acquired passive immunity |
| B. | Artificially acquired active immunity |
| C. | Naturally acquired active immunity |
| D. | Naturally acquired passive immunity |
| Answer» B. Artificially acquired active immunity | |
| 10287. |
Which of the following is the first fungicide [BHU 1995] |
| A. | 2, 4-D |
| B. | D.D.T. |
| C. | B.H.C. |
| D. | Bordeux mixture |
| Answer» E. | |
| 10288. |
Fertilized egg develops into larva and when it is given more food in comparison to others, it develops into |
| A. | Drone |
| B. | Queen |
| C. | Soldier |
| D. | Worker |
| Answer» C. Soldier | |
| 10289. |
Non-essential cotton seed oil and groundnut seed oil is obtained from cotyledons. These oils are |
| A. | Drying type |
| B. | Semi-drying type |
| C. | Non-drying and semi-drying respectively |
| D. | Semi-drying and non-drying respectively |
| Answer» E. | |
| 10290. |
Flamingoes reproduces in [CBSE PMT 1996] |
| A. | Chilka lake |
| B. | Sambhar lake |
| C. | Kutch |
| D. | Mansarovar |
| Answer» B. Sambhar lake | |
| 10291. |
Which of the following changes would be likely to make terrestrial life on this planet impossible [CPMT 1989] |
| A. | A decrease in mean temperature by \[10{}^\circ C\] |
| B. | Change in atmosphere permitting all the solar radiation reaching the upper atmosphere to penetrate to the surface of the earth |
| C. | Change in the orbit of the earth from an ellipse to a circle |
| D. | Disappearance of the moon |
| Answer» C. Change in the orbit of the earth from an ellipse to a circle | |
| 10292. |
The phase of menstrual cycle in humans that last for 7-8 days is [AIIMS 2003] |
| A. | Follicular phase |
| B. | Ovulatory phase |
| C. | Luteal phase |
| D. | Menstruation |
| Answer» C. Luteal phase | |
| 10293. |
Abscisic acid is an antitranspirant. It prevents transpiration by |
| A. | Forming a film impervious to water over the stomata |
| B. | Preventing K+ ion uptake, thus decreasing the osmotic concentration of the guard cells and keeping them flaccid |
| C. | Inducing starch formation, thus decreasing the osmotic concentration of the guard cells and keeping them flaccid |
| D. | Increasing respiration, thus increasing\[C{{O}_{2}}\]concentration in the guard cells which helps in keeping the guard cells flaccid |
| Answer» C. Inducing starch formation, thus decreasing the osmotic concentration of the guard cells and keeping them flaccid | |
| 10294. |
By tissue culture, indefinite number of plants from a small amount of parental tissue can be obtained. This technique is of great economic importance as [AIIMS 1994] |
| A. | New species can be generated |
| B. | Through somaclonal variation, a large number of variants can be isolated |
| C. | It is a useful method to multiply genetically uniform population of elite species |
| D. | Homozygous diploids can be obtained |
| Answer» D. Homozygous diploids can be obtained | |
| 10295. |
If interferon is being produced in the body of a sick person, the person is most likely to be suffering form [CPMT 2004] |
| A. | Typhoid |
| B. | Malaria |
| C. | Measles |
| D. | Tetanus |
| Answer» D. Tetanus | |
| 10296. |
Filaria, malaria, dengue fever, sleeping sickness, yellow fever are transmitted by [DPMT 1986] |
| A. | Mosquitoes |
| B. | House flies |
| C. | Insects |
| D. | Bacteria |
| Answer» D. Bacteria | |
| 10297. |
Which of the following species of silk worm are found in India [BHU 2000; CPMT 2001] |
| A. | Bombyx mori |
| B. | Anthera paphia |
| C. | Anthera assama |
| D. | All the above |
| Answer» E. | |
| 10298. |
Which of the following oil is used in the preparation of typewriter ink |
| A. | Linum oil |
| B. | Brassica oil |
| C. | Chir oil |
| D. | None of the above |
| Answer» B. Brassica oil | |
| 10299. |
The major man made biotic factor is [CPMT 1986] |
| A. | Ploughing |
| B. | Grazing |
| C. | Fire |
| D. | Dairying |
| Answer» D. Dairying | |
| 10300. |
Which is the first national park established in India [BHU 2005] |
| A. | Bandipur national park |
| B. | Corbett national park |
| C. | Kanha national park |
| D. | Periyar national park |
| Answer» C. Kanha national park | |