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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.
| 1451. |
The scrubber is used mainly to remove the following gases from the exhaust after spraying water/lime: |
| A. | \[C{{O}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[{{O}_{2}}\,\And \,{{N}_{2}}\] |
| D. | \[CO\,\And \,C{{O}_{2}}\] |
| Answer» C. \[{{O}_{2}}\,\And \,{{N}_{2}}\] | |
| 1452. |
Which among the following is likely to have the highest levels of D.D.T. depositions in its body? |
| A. | Eel |
| B. | Crab |
| C. | Seagull |
| D. | Phytoplankton |
| Answer» D. Phytoplankton | |
| 1453. |
Why is the concentration of ozone less over the north and south poles? |
| A. | CFCs accumulate only in area where the air is cold |
| B. | CFC use is highest in these areas |
| C. | CFCs stick to frozen water vapour and are able to act catalysts |
| D. | UV rays are stronger in the atmosphere |
| Answer» D. UV rays are stronger in the atmosphere | |
| 1454. |
'Sonic booms'refer to: |
| A. | Shock waves |
| B. | Noise of traffic |
| C. | Noise of siren |
| D. | Nitrates |
| Answer» B. Noise of traffic | |
| 1455. |
The mine workers are most likely to suffer from: |
| A. | Beri-Beri |
| B. | Osteomalacia |
| C. | Scurvy |
| D. | Xerophthalamia |
| Answer» B. Osteomalacia | |
| 1456. |
The sea water gets polluted mainly due to: |
| A. | Industrial waste. |
| B. | Oil spills. |
| C. | Death of marine fauna |
| D. | None of these |
| Answer» C. Death of marine fauna | |
| 1457. |
Which of the following is/are correct regarding Montreal Protocol? (i) Persistent organic pollutants. (ii) Global warming and climate change. (iii) To control the emission of ozone depleting substances. (iv) Biosafety of genetically modified organisms. |
| A. | (i) and (iii) |
| B. | (iii) only |
| C. | (iii) and (iv) |
| D. | (i) and (iii) |
| Answer» C. (iii) and (iv) | |
| 1458. |
Lichens are important in the studies on atmosphere pollution because they: |
| A. | can grow in polluted atmosphere |
| B. | can readily multiply in polluted atmosphere |
| C. | efficiently purify the atmosphere |
| D. | are very sensitive to pollutants like sulphur dioxide |
| Answer» E. | |
| 1459. |
Match column-I with column-II and select the correct option. Column-I Column-II A. Catalytic converter I. Particulate matter B. Electrostatic II. Carbon monoxide and nitrogen oxides C. Earmuffs III. High noise level D. Land fills IV. Solid wastes |
| A. | A-I; B-II; C-III; D-IV |
| B. | A-II; B-I; C-III; D-IV |
| C. | A-IV; B-III; C-II; D-I |
| D. | A-III; B-II; C-IV; D-I |
| Answer» C. A-IV; B-III; C-II; D-I | |
| 1460. |
Photochemical smog always contains: |
| A. | Aluminum ions |
| B. | Methane |
| C. | Ozone |
| D. | Phosphorus |
| Answer» D. Phosphorus | |
| 1461. |
Ozone layer in stratosphere is effected by: |
| A. | Excess \[C{{O}_{2}}\] |
| B. | Excess CO |
| C. | Chloro-fluoro-carbon |
| D. | Low rainfall |
| Answer» D. Low rainfall | |
| 1462. |
Non-point source of water pollution is: |
| A. | Sewage outlet' |
| B. | Effluents from a factory |
| C. | Agricultural runoff |
| D. | All of these |
| Answer» D. All of these | |
| 1463. |
The enrichment of water by nutrients is: |
| A. | Mineralization |
| B. | Biomagnification |
| C. | Eutrophication |
| D. | All of these |
| Answer» D. All of these | |
| 1464. |
It is said, the Taj Mahal may be destroyed due to: |
| A. | food in Yamuna river. |
| B. | decomposition of marble as a result of high temperature. |
| C. | air pollutants released from oil refinery of Mathura. |
| D. | All of the above |
| Answer» D. All of the above | |
| 1465. |
Which pollutant is absent in automobile exhausts? |
| A. | \[S{{O}_{2}}\] |
| B. | Fly ash |
| C. | Hydrocarbon gases |
| D. | Nitrogen oxides |
| Answer» C. Hydrocarbon gases | |
| 1466. |
Gaseous pollutants can be controlled by: |
| A. | Arresters |
| B. | Electrostatic precipitators |
| C. | Pyrolysis |
| D. | Adsorption |
| Answer» E. | |
| 1467. |
Thermal pollution of water bodies is due to: |
| A. | Discharge of heat (hot water) from power plants. |
| B. | Discharge of chemicals from industries. |
| C. | Discharge of waste from mining. |
| D. | Discharge of agricultural runoff. |
| Answer» B. Discharge of chemicals from industries. | |
| 1468. |
In cities like Mumbai and Kolkata the major air pollutants are: |
| A. | Ozone |
| B. | CO and oxides of sulphur |
| C. | Hydrocarbons and hot air |
| D. | Algal spores and marsh gas |
| Answer» C. Hydrocarbons and hot air | |
| 1469. |
The accompanying graph follows the progress of an algal bloom and two associated environmental factors over the course of a year in the North Atlantic Ocean. Which line in the table given the correct identity of W, X and Y? |
| A. | Relative number of algaeRelative light intensityRelative concentration of nutrateWYX |
| B. | XWY |
| C. | WXY |
| D. | XYW |
| Answer» E. | |
| 1470. |
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 | |
| 1471. |
'EcoSan' toilets, being used in Kerala and Srilanka are hygienic and cost effective solution to human waste disposal. Mark the correct statement regarding EcoSan. |
| A. | Recycled human waste from this can be used as a natural fertilizer. |
| B. | They are called composting toilets. |
| C. | They do not depend on water for the disposal of excreta. |
| D. | All of the above |
| Answer» E. | |
| 1472. |
Which of the following statement (s) is/are correct about noise pollution? |
| A. | It is an undesired high level of sound. |
| B. | It is measured in dB. |
| C. | It can cause damage to heart, increase blood cholesterol and even raise blood pressure etc. |
| D. | All of the above |
| Answer» E. | |
| 1473. |
Which of the following is not a major contributor to the current global increase in methane level? |
| A. | Activity of aerobic bacteria in rice paddies. |
| B. | Burning of tropical biomass. |
| C. | Flatulence of herbivorous ruminants. |
| D. | Decomposition of waste in landfill dumps. |
| Answer» B. Burning of tropical biomass. | |
| 1474. |
Which of the following is not used for disinfection of drinking water? |
| A. | Chlorine |
| B. | Ozone |
| C. | Chloramine |
| D. | Phenyl |
| Answer» E. | |
| 1475. |
Which is a non-degradable pollutant? |
| A. | Smoke |
| B. | Polythene |
| C. | Copper scraps |
| D. | Iron scraps |
| Answer» C. Copper scraps | |
| 1476. |
DDT causes egg shell thinning in birds because it inhibits: |
| A. | calmodulin |
| B. | calcium ATPase |
| C. | magnesium ATPase |
| D. | carbonic anhydrase |
| Answer» C. magnesium ATPase | |
| 1477. |
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 | |
| 1478. |
Pollution indicator plants: |
| A. | are resistant to pollution |
| B. | can purify the atmosphere |
| C. | are very sensitive to pollutants |
| D. | can indicate onset of rains |
| Answer» D. can indicate onset of rains | |
| 1479. |
Major aerosol pollutant in jet emission is: |
| A. | Sulphur dioxide |
| B. | Carbon monoxide |
| C. | Methane |
| D. | Fluorocarbon |
| Answer» E. | |
| 1480. |
The below diagram shows electrostatic precipitator. Identify 1, 2 and 3. |
| A. | 1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate grounded |
| B. | 1 - Discharge corona, 2 - Positively charged wire, 3 - Collection plate grounded |
| C. | 1 - Discharge corona, 2 - Negatively charged wire, 3 - Collection plate burnt |
| D. | 1 - Uncharge corona, 2 - Positively charged wire, 3 - Collection plate never grounded |
| Answer» B. 1 - Discharge corona, 2 - Positively charged wire, 3 - Collection plate grounded | |
| 1481. |
In "case \[C{{O}_{2}}\] of earth's atmosphere disappears, the temperature of earth's surface would: |
| A. | Increase |
| B. | Decrease |
| C. | Depend on oxygen concentration |
| D. | Remain the same |
| Answer» C. Depend on oxygen concentration | |
| 1482. |
Which of the following pair is not correctly matched? |
| A. | Autotrophs - Fungi |
| B. | Primary consumers - Zooplankton |
| C. | Secondary consumers - Fishes |
| D. | Decomposers - Flagellates |
| Answer» B. Primary consumers - Zooplankton | |
| 1483. |
Which of the following is not a hypothesis for why food-chain length is limited? |
| A. | Food-chain length is limited by one organism's ability to consume another. |
| B. | Food-chain length is limited because they are easily disrupted by environmental perturbations. |
| C. | Food-chain length is limited by productivity. |
| D. | Food-chain length is a function of an ecosystem's physical structure. |
| Answer» B. Food-chain length is limited because they are easily disrupted by environmental perturbations. | |
| 1484. |
Consider the following statements. (i) An ecosystem is a functional unit of nature and comprises abiotic and biotic components. (ii) Abiotic components are organic materials. (iii) Biotic components are producers, consumers and decomposers. (iv) Energy flow is bidirectional. Which two statements are correct? |
| A. | (i) and (ii) |
| B. | (ii) and (iv) |
| C. | (iii) and (iv) |
| D. | (i) and (iii) |
| Answer» E. | |
| 1485. |
Competition for water, minerals, light and space is most severe between two: |
| A. | Closely related species occupying the same niche. |
| B. | Closely related species occupying different niche. |
| C. | Unrelated species occupying the same niche. |
| D. | Species occupying different overlapping ecosystems. |
| Answer» B. Closely related species occupying different niche. | |
| 1486. |
Blue whale, which inhabits Antarctica, has a requirement of more than a million calories per day. Which one of the following planktonic organisms forms the bulk of food to fulfill its caloric requirement? |
| A. | Dinoflagellates |
| B. | Diatoms |
| C. | Green algae |
| D. | Krill |
| Answer» E. | |
| 1487. |
The given figure best represents. |
| A. | Pyramid of number in parasitic food chain |
| B. | Pyramid of biomass in forest ecosystem |
| C. | Pyramid of number in grassland ecosystem |
| D. | Pyramid of number in forest ecosystem |
| Answer» E. | |
| 1488. |
The following diagram shows a mountain with a sea breeze blowing as indicated by the arrow. Circle the letter for the area with air that would be both relatively warm and dry. |
| A. | Area A |
| B. | Area C |
| C. | Area D |
| D. | Area E |
| Answer» E. | |
| 1489. |
Which of following is/are trend (s) in ecological succession? (i) An increase in complexity of species. (ii) An increase in productivity. (iii) An increase in community stability and species diversity. (iv) A decrease in nonliving organic materials. |
| A. | (i) and (iii) |
| B. | (i) and (iv) |
| C. | (i), (ii) and (iii) |
| D. | (i), (ii), (iii) and (iv) |
| Answer» C. (i), (ii) and (iii) | |
| 1490. |
Which of the following ecological pyramid is never inverted? |
| A. | Pyramid of number in forest ecosystem. |
| B. | Pyramid of biomass in pond ecosystem. |
| C. | Pyramid of energy in parasitic food chain. |
| D. | Pyramid of biomass in parasitic food chain. |
| Answer» D. Pyramid of biomass in parasitic food chain. | |
| 1491. |
An incomplete ecosystem is: |
| A. | Grassland |
| B. | River |
| C. | Wetland |
| D. | Cave |
| Answer» E. | |
| 1492. |
Which of the following statements concerning acid precipitation is incorrect? |
| A. | Acids that enter the atmosphere primarily affect ecosystems located less than 100 kilometers from the source of the pollution. |
| B. | The effects of acidification of lakes appear to be quickly reversible if their pH can be returned to normal. |
| C. | While regulation of emission sources has raised, the pH of precipitation in parts of the eastern United States, precipitation in many parts of the West is becoming more acidic. |
| D. | Sulfuric acid and nitric acid from smokestack and automobile emissions are the major causes of acid precipitation. |
| Answer» B. The effects of acidification of lakes appear to be quickly reversible if their pH can be returned to normal. | |
| 1493. |
The animals which occupy the same trophic level are: |
| A. | Lion & bees |
| B. | Deer & bees |
| C. | Snakes & earthworm |
| D. | Crow & cow |
| Answer» C. Snakes & earthworm | |
| 1494. |
If an ecosystem is composed of only three trophic levels then how much energy will be conserved at the III trophic level: |
| A. | 0.3 |
| B. | 0.2 |
| C. | 0.1 |
| D. | 0.01 |
| Answer» E. | |
| 1495. |
The flow of DDT through the food chain, culminating in the deaths of cats in Borneo, represents the: |
| A. | number of links in an ecosystem. |
| B. | need to understand how resources are passed through an ecosystem. |
| C. | need for stringent testing of anything that might affect the environment. |
| D. | All of the above |
| Answer» D. All of the above | |
| 1496. |
When me number to organisms at successive levels are plotted, they give the shape of a pyramid. This is called the pyramid of: |
| A. | Number |
| B. | Energy |
| C. | Biomass |
| D. | None of these |
| Answer» B. Energy | |
| 1497. |
Which food chain produces greater available energy? |
| A. | Diatoms \[\to \]fish\[\to \]large fish\[\to \]birds\[\to \]man |
| B. | Green plant\[\to \]rabbit\[\to \]man |
| C. | Green plant\[\to \]grass hopper\[\to \]frog\[\to \]snake \[\to \]peacock |
| D. | Green plant\[\to \]rabbit\[\to \]wolf\[\to \]man |
| Answer» C. Green plant\[\to \]grass hopper\[\to \]frog\[\to \]snake \[\to \]peacock | |
| 1498. |
The flow of materials and energy in an ecosystem is respectively: |
| A. | Cyclic only |
| B. | Cyclic and linear |
| C. | Linear and cyclic |
| D. | Linear only |
| Answer» C. Linear and cyclic | |
| 1499. |
A recently discovered ecosystem is: |
| A. | Crater |
| B. | Tundra |
| C. | Floating iceberg |
| D. | Vent |
| Answer» E. | |
| 1500. |
Each trophic level has a certain mass of living material at a particular time is known as: |
| A. | Catabolism |
| B. | Standing crop |
| C. | Humification |
| D. | Primary productivity |
| Answer» C. Humification | |