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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.
| 1401. |
One of the important consequences of geographical isolation is: |
| A. | Random creation of new species. |
| B. | No change in the isolated fauna. |
| C. | Preventing speciation. |
| D. | Speciation through reproductive isolation. |
| Answer» E. | |
| 1402. |
Evolution is a: |
| A. | Progressive development of a race. |
| B. | History and development of a race along with variations. |
| C. | History of a race. |
| D. | Development of a race. |
| Answer» C. History of a race. | |
| 1403. |
Under certain conditions scientists have obtained cell-like structures. These are known as: |
| A. | Prebiotic soup |
| B. | Coacervates |
| C. | Protists |
| D. | Microbes |
| Answer» C. Protists | |
| 1404. |
Evolutionary convergence is characterised by: |
| A. | Development of dissimilar characteristics in closely related groups. |
| B. | Development of common set of characteristics in groups of different ancestory. |
| C. | Development of characteristics by random mating. |
| D. | Replacement of common characteristics in different groups. |
| Answer» C. Development of characteristics by random mating. | |
| 1405. |
Sita saw an old Tarzan movie on television. The movie supposedly took place in Africa, but Trina easily spotted that it was not really filmed there. Which of the following could have tipped her off? |
| A. | Chimps like Cheetah do not live in Africa. |
| B. | The monkeys in the jungle all had prehensile tails. |
| C. | There were no lemurs shown in the forest. |
| D. | Tarzan wrestled with a gorilla. |
| Answer» C. There were no lemurs shown in the forest. | |
| 1406. |
Identify the incorrect statements regarding origin of life: (i) Swan-neck flask experiment was performed by Louis Pasteur. (ii) Louis Pasteur is famous for germ theory of disease. (iii) Louis Pasteur disapproved spontaneous theory forever. (iv) Cosmozoic theory of origin of life was proposed by Richter. (v) Theory of Catasrophism was given by Georges Cuvier. |
| A. | (i), (ii) and (iv) |
| B. | (i), (ii), and (v) |
| C. | (i), (ii), (iii), (iv) and (v) |
| D. | None of the above |
| Answer» E. | |
| 1407. |
The first formed organism (riboorganism) used only........for catalysing reactions. |
| A. | DNA |
| B. | Amino acids |
| C. | Fatty acids |
| D. | RNA |
| Answer» E. | |
| 1408. |
The most primitive cell-like chemical aggregates capable of growth and division were: |
| A. | Chemoautotrophs |
| B. | Eobionts |
| C. | Prokaryotes |
| D. | Microspheres |
| Answer» E. | |
| 1409. |
How has the free \[{{O}_{2}}\] been released into the earth's atmosphere as there was no free \[{{O}_{2}}\] at the time of origin of life? |
| A. | By catabolic activity of animals |
| B. | By photosynthetic activity |
| C. | By heating of the earth |
| D. | None of the above |
| Answer» C. By heating of the earth | |
| 1410. |
Which one of the following amino acids was not found to be synthesised in Miller's experiment? |
| A. | Alanine |
| B. | Glycine |
| C. | Aspartic acid |
| D. | Glutamic acid |
| Answer» E. | |
| 1411. |
Coacervates belongs to which of the following categories? |
| A. | Cyanobacteria |
| B. | Protozoans |
| C. | Molecular aggregate with lipid bilayer. |
| D. | Molecular aggregate which lack definite lipid membrane. |
| Answer» E. | |
| 1412. |
The diversity within the wild bird species in the diagram below can best be explained by which process? |
| A. | Natural selection |
| B. | Ecological succession |
| C. | Adaptive radiation |
| D. | Both [a] and [c] |
| Answer» E. | |
| 1413. |
Which of the following is a correct? |
| A. | Homo erectus lived in east and central Asia and used hides to protect their bodies. |
| B. | Agriculture came around 18000 years back. |
| C. | The skull of modem human resembles more closely to baby chimpanzee than to adult chimpanzee. |
| D. | All of the above |
| Answer» D. All of the above | |
| 1414. |
Select the correct order of geological time scale of earth. |
| A. | Palaeozoic \[\to \] Archaeozoic \[\to \] Coenozoic |
| B. | Archaeozoic \[\to \] Palaeozoic \[\to \] Proterozoic |
| C. | Palaeozoic \[\to \] Mesozoic \[\to \] Coenozoic |
| D. | Mesozoic \[\to \] Archaeozoic \[\to \] Proterozoic |
| Answer» D. Mesozoic \[\to \] Archaeozoic \[\to \] Proterozoic | |
| 1415. |
The ultimate source of all genetic variation is: |
| A. | Natural selection |
| B. | Genetic drift |
| C. | Sexual recombination |
| D. | Mutation |
| Answer» E. | |
| 1416. |
The tendency of population to remain in genetic equilibrium may be disturbed by: |
| A. | Random mating |
| B. | Lack of immigration |
| C. | Lack of mutations |
| D. | Lack of random mating |
| Answer» E. | |
| 1417. |
Miller synthesised simple amino acids from water vapours and mixtures containing: |
| A. | \[{{H}_{2}},{{O}_{2,}}{{N}_{2}}\](1:2:1) |
| B. | \[{{H}_{2}},{{O}_{2,}}{{N}_{2}}\](2: 1:2) |
| C. | \[C{{H}_{4}},N{{H}_{3,}}{{H}_{2}}\](2:1:2) |
| D. | \[C{{H}_{4}},N{{H}_{3,}}{{H}_{2}}\](1:2:1) |
| Answer» E. | |
| 1418. |
Trilobite is an extinct: |
| A. | Mammal |
| B. | Reptile |
| C. | Mollusc |
| D. | Arthropod |
| Answer» E. | |
| 1419. |
What was the most significant trend in the evolution of modem man (Homo sapiens) from his ancestors? |
| A. | Shortening of jaws. |
| B. | Binocular vision. |
| C. | Increasing cranial capacity. |
| D. | Upright posture. |
| Answer» D. Upright posture. | |
| 1420. |
Which of the following pairs of terms is not related? |
| A. | Evolution - Natural selection |
| B. | Vestigial structure - Appendix. |
| C. | Analogous structures - Butterfly wings |
| D. | Adaptive radiations - Vertebrates hearts or brains |
| Answer» E. | |
| 1421. |
Choose the incorrect statement regarding Hardy-Weinberg principle. |
| A. | Allele frequencies in a population are stable and constant from generation to generation. |
| B. | Sum total of all the allelic frequencies in a population is 1. |
| C. | Variation due to genetic drift results in changed frequency of genes and alleles in future generations. |
| D. | Genetic recombination helps in maintaining Hardy-Weinberg equilibrium. |
| Answer» E. | |
| 1422. |
Homo habilis was the first of our ancestors to: |
| A. | Have a brain size equal to (or larger than) ours. |
| B. | Leave written records. |
| C. | Use tools. |
| D. | Have definitely diverged from the apes. |
| Answer» D. Have definitely diverged from the apes. | |
| 1423. |
The first ribozyme was found in: |
| A. | Nuclear gene for a DNA replicating enzyme. |
| B. | Mitochondrial gene for a respiratory enzyme. |
| C. | mRNA for a mitochondrial enzyme. |
| D. | An intron within a pre-rRNA molecule. |
| Answer» E. | |
| 1424. |
Desulfovibrio is a bacterium that breaks down organic matter which it must have and uses sulphate not oxygen as an electron acceptor. As a result, it produces hydrogen sulphide (\[{{H}_{2}}S\]), accounting for the 'rotten egg' smell of swamp muck. Oxygen is a deadly poison to Desulfovibrio. We would call Desulfovibrio a(n): |
| A. | facultatively anaerobic chemoautotroph. |
| B. | obligately anaerobic chemoheterotroph. |
| C. | facultatively aerobic chemoheterotroph. |
| D. | obligately anaerobic chemoautotroph. |
| Answer» C. facultatively aerobic chemoheterotroph. | |
| 1425. |
Both prokaryotic and eukaryotic fossils are found in: |
| A. | Azoic |
| B. | Coenozic |
| C. | Proterozoic |
| D. | Archaeozoic |
| Answer» E. | |
| 1426. |
The presence of which one of the following was absolutely essential for the development of the first life forms? |
| A. | Heat produced by a planet whose surface was still warm. |
| B. | A reducing atmosphere. |
| C. | Volcanoes spewing forth various gases. |
| D. | UV light. |
| Answer» C. Volcanoes spewing forth various gases. | |
| 1427. |
Which of the following is/are incorrect about Neanderthal man? (i) Had large brain around 900 c.c. (ii) Lived in near east and central Asia between 100000-40000 years back. (iii) Used hides to protect their body and buried their dead. (iv) Had no religious feeling. |
| A. | All of these |
| B. | None of these |
| C. | (i) and (iv) |
| D. | (ii) and (iii) |
| Answer» D. (ii) and (iii) | |
| 1428. |
Match column-I with column-II and select the correct option. Column-I Column-II A. Saltation I. Darwin B. Formation of life was preceded II. Louis Pasteur C. Reproductive fitness III. De Vries D. Life comes from pre-existing life IV. Oparin and haldance |
| A. | A-III; B-IV; C-I; D-II |
| B. | A-IV; B-III; C-II; D-I |
| C. | A-II; B-III; C-I; D-IV |
| D. | A-I; B-IV; C-III; D-II |
| Answer» B. A-IV; B-III; C-II; D-I | |
| 1429. |
Which characteristic of living monkeys suggests that the earliest anthropoids were monkey-like? |
| A. | All monkeys lack tails, like prosimians. |
| B. | All monkeys are arboreal, like prosimians. |
| C. | Like prosimians, monkeys rely more on smell than on eyesight for finding food and avoiding predators. |
| D. | Of all the anthropoids, monkeys have brains that are most similar in size (relative to body size) to those of prosimians. |
| Answer» E. | |
| 1430. |
The Miller-Urey abiotic synthesis experiment (and other subsequent, similar experiments) shows that: |
| A. | simple organic molecules can for spontaneously under conditions like those thought to prevail early in the earth's history. |
| B. | The earliest life forms introduced large amounts of oxygen to the atmosphere. |
| C. | Life can be created in a test tube. |
| D. | Long chains of DNA can form under abiotic conditions. |
| Answer» B. The earliest life forms introduced large amounts of oxygen to the atmosphere. | |
| 1431. |
The maximum biological magnification of DDT through food web is seen in: |
| A. | Algae |
| B. | Bacteria |
| C. | Higher plants |
| D. | Man |
| Answer» E. | |
| 1432. |
Secondary treatment of sewage is: |
| A. | biological degradation of organic material by microorganisms under controlled conditions. |
| B. | chlorination to kill pathogenic microbes. |
| C. | separation of heavy metals from sewage. |
| D. | sedimentation of heavy particles. |
| Answer» B. chlorination to kill pathogenic microbes. | |
| 1433. |
Prolonged water logging in an agricultural fields is likely to create the problem of: |
| A. | poor aeration and low salinity |
| B. | poor aeration and high salinity |
| C. | poor aeration and high acidity |
| D. | metal toxicity and proper aeration |
| Answer» C. poor aeration and high acidity | |
| 1434. |
Deforestration has caused: |
| A. | more floods and decrease of temperature. |
| B. | more drought and decrease of temperature. |
| C. | shortage of food products. |
| D. | soil erosion and loss of wildlife. |
| Answer» E. | |
| 1435. |
The antiknock agent added to unleaded petrol is: |
| A. | Tetraethyllead |
| B. | Tetramethyllead |
| C. | Dibromoethane |
| D. | Methyltertiary butyl ether |
| Answer» E. | |
| 1436. |
Which of the following strategy is incorrect approach to reduce global warming? |
| A. | Reducing the greenhouse gas emission by limiting the use of fossil fuels. |
| B. | Increase the vegetation cover particularly the forest for photosynthetic utilization of\[C{{O}_{2}}\]. |
| C. | Minimizing the use of nitrogen fertilizers in agriculture for reducing\[N{{O}_{2}}\]emission. |
| D. | Increasing the use of air conditioners, refrigeration unit and production of plastic foams and propellants in aerosal spray cans. |
| Answer» E. | |
| 1437. |
Increase in productivity most likely cause loss of species because: |
| A. | those species that increase in productivity outcompete other species. |
| B. | the causes of increased productivity in one species do not necessarily have the same effect in all species. |
| C. | there are inadequate resources available for productivity increases in all species. |
| D. | All of the above |
| Answer» E. | |
| 1438. |
Heavy metals are detoxified in plants by: |
| A. | ABA |
| B. | Allelopathins |
| C. | Phytochelatins |
| D. | Phytoalexins |
| Answer» D. Phytoalexins | |
| 1439. |
The automobile emission can be reduced by adding the following in the petrol: |
| A. | Calcium salts |
| B. | Cobalt salts |
| C. | Silicon oil |
| D. | Barium salts |
| Answer» E. | |
| 1440. |
Industrial waste containing non-biodegradable substance left in a pool of water and a person eating a fish of that water, showing signs of toxicity is a typical example of: JH Critical |
| A. | biological multiplication. |
| B. | biological magnification. |
| C. | accidental care of toxicity. |
| D. | not fish but the person showing toxic effect. |
| Answer» C. accidental care of toxicity. | |
| 1441. |
Water pollution can be stopped best by: |
| A. | Treating effluents to remove injurious chemicals. |
| B. | Rearing more fishes. |
| C. | Cultivating useful water plants. |
| D. | Spraying with DDT. |
| Answer» B. Rearing more fishes. | |
| 1442. |
Fishes die by sewage because: |
| A. | Of its bad smell. |
| B. | It replaces food material of fishes. |
| C. | It increases oxygen competition among fishes. |
| D. | \[C{{O}_{2}}\] is mixed in large amount in water. |
| Answer» D. \[C{{O}_{2}}\] is mixed in large amount in water. | |
| 1443. |
Which one has the least greenhouse effect? |
| A. | Carbon dioxide |
| B. | Nitrogen gas |
| C. | Water vapours |
| D. | Ozone |
| Answer» C. Water vapours | |
| 1444. |
The amount of freshwater of the earth frozen as polar or glacial ice is: |
| A. | 0.5% |
| B. | 0.0002 |
| C. | 0.01% |
| D. | 0.0197 |
| Answer» E. | |
| 1445. |
The percentage of air pollution caused due to smoke is: |
| A. | 10-15% |
| B. | 15-20% |
| C. | 20-25% |
| D. | 2-5% |
| Answer» B. 15-20% | |
| 1446. |
Among the following environmental pollutants, which one is concerned with biological amplification? |
| A. | \[S{{O}_{2}}\] |
| B. | \[{{O}_{3}}\,and\,C{{O}_{2}}\] |
| C. | Hg and fungicides |
| D. | \[N{{O}_{2}}\] |
| Answer» D. \[N{{O}_{2}}\] | |
| 1447. |
The most harmful effect of ionizing radiations precisely involves: |
| A. | Cell membranes |
| B. | DNA |
| C. | Mitochondria and ribosomes |
| D. | Nucleus |
| Answer» C. Mitochondria and ribosomes | |
| 1448. |
Secondary air pollutant is: |
| A. | PAN |
| B. | CO |
| C. | SO, |
| D. | aerosols |
| Answer» B. CO | |
| 1449. |
Soil fertility can be destroyed by: |
| A. | cutting down forests |
| B. | acid rain |
| C. | overgrazing and overirrigation |
| D. | All of the above |
| Answer» E. | |
| 1450. |
Which one of the following is a most efficient device to eliminate particulate matters from the industrial emissions? |
| A. | Cyclonic separators |
| B. | Trajectory separators |
| C. | Incineration |
| D. | Electrostatic precipitator |
| Answer» E. | |