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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.
| 14051. |
Which one of the following supports the 'multi- regional' hypothesis of the origin of mode humans from archaic Homo sapiens? |
| A. | The high variability of nuclear DNA in some modem Africans. |
| B. | The uniformity in mtDNA among modem human populations. |
| C. | The oldest known fossils of modem Homo sapiens have been found in Africa. |
| D. | The existence of distinctive human races. |
| Answer» E. | |
| 14052. |
The shape of the heals of Darwins finches, industrial melanism, or the changes in horse teeth are all examples of: |
| A. | Artificial selection |
| B. | Natural selection |
| C. | Convergent evolution |
| D. | Homologous structures |
| Answer» C. Convergent evolution | |
| 14053. |
The finches of Galapagos islands provide an evidence in favour of: |
| A. | Evolution due to mutation. |
| B. | Retrogressive evolution. |
| C. | Biogeographical evolution. |
| D. | Special creation. |
| Answer» D. Special creation. | |
| 14054. |
The similarity of mitochondrial DNA among different human races suggests that the races: |
| A. | All arose from a single ancestral population. |
| B. | Are closely related to chimpanzees. |
| C. | Share no recent common ancestor. |
| D. | Arose from distinct ancestral populations. |
| Answer» B. Are closely related to chimpanzees. | |
| 14055. |
Which of the following has been basic material for the origin of life? |
| A. | Carbohydrates |
| B. | Proteins |
| C. | Nucleic acids |
| D. | Nucleoproteins |
| Answer» D. Nucleoproteins | |
| 14056. |
The atmosphere of early earth probably contained no\[{{O}_{2}}\]until the emergence of organisms that: |
| A. | Were chemoautotrophic. |
| B. | Were oxygen-respiring. |
| C. | Used hydrogen sulfide as a hydrogen source for photosynthesis. |
| D. | Used water as a hydrogen source for photosynthesis. |
| Answer» E. | |
| 14057. |
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. | |
| 14058. |
Man who first built huts and burried the dead with ceremonies are: |
| A. | Java man |
| B. | Neanderthal |
| C. | Cro-Magnon |
| D. | Peking man |
| Answer» C. Cro-Magnon | |
| 14059. |
Following is the diagrammatic representation of the operation of natural selection of different traits. Which of the following options correctly identifies all the three graphs A, B and C. |
| A. | ABCDirectionalStabilisingDisruptive |
| B. | StabilisingDirectionalDisruptive |
| C. | DisruptiveStabilisingDirectional |
| D. | DirectionalDisruptiveStabilising |
| Answer» C. DisruptiveStabilisingDirectional | |
| 14060. |
Coloured rock-paintings were presumably first made by: |
| A. | Cro-Magnon man |
| B. | Neanderthal man |
| C. | Java ape-man |
| D. | Peking man |
| Answer» B. Neanderthal man | |
| 14061. |
Man differs from apes in having: |
| A. | Legs longer than arms. |
| B. | Protruding jaws. |
| C. | Grasping hands. |
| D. | Poorly developed forehead. |
| Answer» B. Protruding jaws. | |
| 14062. |
Australopithecus was the first of our ancestors known to: |
| A. | Move out of Africa and spread throughout Eurasia. |
| B. | Have definitely diverged from the apes. |
| C. | Leave written records. |
| D. | Have a brain size equal to or larger than ours. |
| Answer» C. Leave written records. | |
| 14063. |
The earliest primates were most similar to modem: |
| A. | Arboreal prosimians |
| B. | Arboreal anthropoids |
| C. | Ground-dwelling anthropoids |
| D. | Ground-dwelling prosimians |
| Answer» B. Arboreal anthropoids | |
| 14064. |
Km is related to [BHU 2000] |
| A. | Morphology |
| B. | ABO blood group |
| C. | ES complex |
| D. | Chromatography |
| Answer» D. Chromatography | |
| 14065. |
Cofactor (prosthetic group) is a part of holoenzyme. It is [CBSE PMT 1997] |
| A. | Loosely attached inorganic part |
| B. | Accessory non-protein substance attached firmly |
| C. | Loosely attached organic part |
| D. | None of these |
| Answer» C. Loosely attached organic part | |
| 14066. |
Name the scientist who for the first time isolated and purified the enzyme urease in crystalline form from Jack bean (Canavalia ensiformis) |
| A. | Kuhne (1826) |
| B. | Hayashi (1826) |
| C. | Kurosawa (1926) |
| D. | Sumner (1926) |
| Answer» E. | |
| 14067. |
When coenzyme is combined with apoenzyme, it is called [AIIMS 1990; CMC Vellore 1994] |
| A. | Cofactor |
| B. | Holoenzyme |
| C. | Substrate enzyme complex |
| D. | Vitamin A |
| Answer» C. Substrate enzyme complex | |
| 14068. |
Agenda-21 was adopted in: |
| A. | Kyoto protocol |
| B. | Earth summit |
| C. | Helsinki declaration |
| D. | Montreal protocol |
| Answer» B. Earth summit | |
| 14069. |
Blue baby syndrome is due to: |
| A. | Mercury in drinking water. |
| B. | Excess of nitrates in drinking water. |
| C. | Cd-poisoning. |
| D. | As-poisoning. |
| Answer» C. Cd-poisoning. | |
| 14070. |
So-called greenhouse gases have been given this name because they: |
| A. | trap the heat radiated from Earth's surface. |
| B. | are produced by plants. |
| C. | are necessary for plant growth. |
| D. | are similar to gases produced in a greenhouse |
| Answer» B. are produced by plants. | |
| 14071. |
In B.O.D. test, oxygen plays an important role to: |
| A. | Destroy inorganic matter. |
| B. | Destroy pollution. |
| C. | Destroy waste organic matter. |
| D. | None of the above |
| Answer» D. None of the above | |
| 14072. |
Two lakes, A and B are identical in all aspects except that lake A has higher temperature. Which of the following is true? |
| A. | A has higher rate of oxygen dissolution |
| B. | B has higher rate of oxygen dissolution |
| C. | Oxygen dissolution of both is the same |
| D. | Both have same BOD |
| Answer» C. Oxygen dissolution of both is the same | |
| 14073. |
Which one of the following is an environment related disorder with the correct main cause? |
| A. | Black lung disease (pneumoconiosis) found mainly in workers in stone quarries and crushers. |
| B. | Blue baby disease (methaemoglobinaemia) due to heavy use of nitrogenous fertilizers in the area. |
| C. | Non-hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides. |
| D. | Skin cancer mainly in people exposed to benzene and methane. |
| Answer» C. Non-hodgkin's lymphoma found mainly in workers involved in manufacture of neem based pesticides. | |
| 14074. |
All organic substance found in the biosphere necessarily contain: |
| A. | Silica |
| B. | Carbon |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» C. Oxygen | |
| 14075. |
If global warming continues, the organism which may face more severe threat is: |
| A. | Cow |
| B. | Dog |
| C. | Snow leopard |
| D. | Dolphin |
| Answer» D. Dolphin | |
| 14076. |
Main air pollutant is: |
| A. | \[C{{O}_{2}}\] |
| B. | CO |
| C. | \[{{N}_{2}}\] |
| D. | Sulphur |
| Answer» C. \[{{N}_{2}}\] | |
| 14077. |
Which of the following statements about eutrophication are correct? (i) It can be a naturally occurring process. (ii) It is commonly found in standing rather than running water. (iii) It can lead to oxygen depletion. (iv) It is commonly associated with high levels of phosphates and nitrates. |
| A. | (iii) and (iv) |
| B. | (i), (ii) and (iii) |
| C. | (ii), (iii) and (iv) |
| D. | All of the above |
| Answer» E. | |
| 14078. |
Match column-I with column-II and select the correct answer using the codes given below. Column-I Column-II A. Carbon Monoxide I. Qualitative Pollutant B. DDT II. Freon C. Chlorofluoro-methane III. Lung Cancer D. Smoking IV. Quantitative Pollutant E. Acid rain V. Nitrogen and Sulphur oxides |
| A. | A-II; B-I; C-IV; D-V; E-III |
| B. | A-IV; B-I; C-II; D-III; E-V |
| C. | A-III; B-II; C-IV; D-I; E-V |
| D. | A-V; B-III; C-I; D-II; E-IV |
| Answer» C. A-III; B-II; C-IV; D-I; E-V | |
| 14079. |
Identify the deleterious effect of deforestation. (i) CO, concentration increases. (ii) Habitat destruction leading to loss of biodiversity. (iii) Disturbance in hydrologic cycle. (iv) Desertification. Which of the statement given above are correct? |
| A. | (i), (ii) and (iii) |
| B. | (ii), (iii) and (iv) |
| C. | (i), (iii) and (iv) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» E. | |
| 14080. |
The greatest air pollution disaster during recent years had been witnessed in: |
| A. | Kolkata |
| B. | Ahmedabad |
| C. | Agra |
| D. | Bhopal |
| Answer» E. | |
| 14081. |
Carbon monoxide (CO) is harmful to man because: |
| A. | It forms carbolic acid. |
| B. | It generates excess \[C{{O}_{2}}\] |
| C. | It is carcinogenic. |
| D. | It competes with\[{{O}_{2}}\]for haemoglobin. |
| Answer» E. | |
| 14082. |
Which of the following does not cause pollution? |
| A. | Thermal power project |
| B. | Steel power plant |
| C. | Automobiles |
| D. | Hydroelectric project |
| Answer» E. | |
| 14083. |
Match Column-1 with Column- II and select the correct answer using the codes given below. Column-I Column-II A. Nitrous oxide I. Secondary pollutant B. Chlorofluorocarbon II. Combustion of fossil fuels, C. Methane III. Denitrification D. Ozone(\[{{O}_{3}}\]) IV. Refrigerators E. Carbon dioxide V. Cattle, rice field, toilets. |
| A. | A-III; B- IV; C- V; D- I; E-II |
| B. | A-V; B- I; C- III; D-IV; E- II |
| C. | A-IV; B-V; C-I; D-II; E-III |
| D. | A-1; B-III; C-IV; D-V; E-II |
| Answer» B. A-V; B- I; C- III; D-IV; E- II | |
| 14084. |
Mark the statement that describes the eco- friendly disposal of municipal solid- waste. |
| A. | It should be burnt to completion. . |
| B. | It should be dumped in open waste land. |
| C. | It should be dumped in sanitary landfills. |
| D. | It should be sorted out into bio-degradable, non- biodegradable and recyclable wastes and treated separately. |
| Answer» E. | |
| 14085. |
Frequent occurrence of water blooms in a lakeindicates: |
| A. | Nutrient deficiency. |
| B. | Oxygen deficiency. |
| C. | Excessive nutrient availability. |
| D. | Absence of herbivores in the lake. |
| Answer» C. Excessive nutrient availability. | |
| 14086. |
Consider the following statements. Choose the correct option. (i) By the end of twentieth century, the forest cover in India was reduced to 19.4 percent. (ii) National Forest Policy was implemented in the year 1988. (iii) The average annual production of dry grass or hay in India is about 250 million tons. (iv) About 10% of the world's population lives in arid or semi arid regions. |
| A. | (i) and (ii) are true |
| B. | (i), (iii) and (iv) are false |
| C. | (i), (ii), and (iii) are true |
| D. | (iii) is false |
| Answer» D. (iii) is false | |
| 14087. |
Identify correct statement and choose the option. |
| A. | The major contribution in greenhouse gases is of\[C{{H}_{4}}\]. |
| B. | Global warming is because of ozone depletion. |
| C. | When organic waste enters into a water body its BOD increases. |
| D. | All of the above |
| Answer» D. All of the above | |
| 14088. |
Effect of pollution is first marked on: |
| A. | Micro-organisms |
| B. | Green vegetation of an area |
| C. | Food crop |
| D. | Mammals |
| Answer» B. Green vegetation of an area | |
| 14089. |
The Montreal Protocol refers to: |
| A. | persistent organic pollutants |
| B. | global warming and climate change |
| C. | substances that deplete the ozone layer |
| D. | biosafety of genetically modified organisms |
| Answer» D. biosafety of genetically modified organisms | |
| 14090. |
Which of the following phenomenon is represented by the given figure? |
| A. | Green-house effect |
| B. | El Nino effect |
| C. | Ozone hole |
| D. | Eutrophication |
| Answer» B. El Nino effect | |
| 14091. |
Maintenance of forests in areas with increasing carbon dioxide levels is critical because: |
| A. | forests can serve as carbon dioxide sinks by increasing photosynthesis. |
| B. | the use of carbon dioxide by trees reduces carbon dioxide in the atmosphere. |
| C. | forests are needed to reduce global warming. |
| D. | All of the above |
| Answer» E. | |
| 14092. |
Match column-I with column-II and select the correct option. Column-I Column-II A. Environment (Protection) Act I. 1987 B. Air (Prevention and Control of Pollution) Act II. 1986 C. Water (Prevention and control of Pollution) Act III. 1980 D. Concept of Joint Forest Management of Govt. of India IV. 1974 |
| A. | A-IV; B-III; C-II; D-I |
| B. | A-II; B-I; C-IV; D-III |
| C. | A-I; B-II; C-III; D-IV |
| D. | A-I; B-III; C-II; D-IV |
| Answer» C. A-I; B-II; C-III; D-IV | |
| 14093. |
Noise pollution is created if noise is in excess to: |
| A. | 70-75 dB |
| B. | 50-60 dB |
| C. | 80-99 dB |
| D. | 40-65 dB |
| Answer» D. 40-65 dB | |
| 14094. |
Which organisms in a food chain consisting of algae, copepods (small crustaceans), small fish, large fish, and ospreys (fish-eating birds of prey) would have the highest concentrations of DDT in their tissues? |
| A. | Algae |
| B. | Copepods |
| C. | Small fish |
| D. | Ospreys |
| Answer» E. | |
| 14095. |
Pollution of \[S{{O}_{2}}\] destroys: |
| A. | Fungi |
| B. | Lichen |
| C. | Algae |
| D. | Fishes |
| Answer» C. Algae | |
| 14096. |
The diagram below shows the effect of polluting a river with untreated whey. What does graph X represent? |
| A. | Bacterial count |
| B. | Number of fish |
| C. | Mass of curds |
| D. | Concentration of rennet |
| Answer» B. Number of fish | |
| 14097. |
Photochemical smog does not include: |
| A. | PAN |
| B. | \[N{{O}_{x}}\] |
| C. | CO |
| D. | \[{{O}_{3}}\] |
| Answer» D. \[{{O}_{3}}\] | |
| 14098. |
Bhopal gas accident occurred in which year and due to which gas? |
| A. | 1986/Methyl isocynate |
| B. | 1984/Methyl isocynate |
| C. | 1985/CO |
| D. | 1985/Ethyl isocynate |
| Answer» C. 1985/CO | |
| 14099. |
Plankton, Nekton and Benthos are not the components of one of ecosystems which is: |
| A. | Oceans |
| B. | Fresh water rivers |
| C. | Grassland |
| D. | Pond or lake |
| Answer» D. Pond or lake | |
| 14100. |
In terrestrial ecosystem, maximum energy is present in: |
| A. | \[{{T}_{3}}\] |
| B. | \[{{T}_{2}}\] |
| C. | \[{{T}_{1}}\] |
| D. | \[{{T}_{4}}\] |
| Answer» D. \[{{T}_{4}}\] | |