MCQOPTIONS
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MCQOPTIONS
This section includes 5751 Mcqs, each offering curated multiple-choice questions to sharpen your Biology knowledge and support exam preparation. Choose a topic below to get started.
| 3001. |
The earliest organisms were ______. |
| A. | heterotrophic and anaerobic |
| B. | autotrophic and anaerobic |
| C. | heterotrophic and aerobic |
| D. | autotrophic and aerobic |
| Answer» B. autotrophic and anaerobic | |
| 3002. |
Which one of the following is present today but was absent about 3.5 billion years ago ? |
| A. | Oxygen |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | Methane |
| Answer» B. Nitrogen | |
| 3003. |
Match the appropriatc :_ans_key_Column – I Column – II_ans_key_A. Cosmozoan theory (i) Oxidizing environment rich in autotrophs like cyanobacteria_ans_key_B. Spontaneous generation (ii) Microspheres_ans_key_C. Primary abiogenesis (iii) Hot ball of gases_ans_key_D. Atmosphere I (iv) Oparin and Haldane_ans_key_E. Atmosphere III (v) Panspermia_ans_key_F. Sydney Fox (vi) Abiogenesis_ans_key_A B C D E F A B C D E F |
| A. | (v) (vi) (iv) (iii) (i) (ii) |
| B. | (i) (ii) (iii) (iv) (v) (vi) |
| C. | (ii) (iii) (i) (v) (vi) (iv) |
| D. | (vi) (iv) (iii) (v) (ii) (i) |
| Answer» B. (i) (ii) (iii) (iv) (v) (vi) | |
| 3004. |
A living connecting link which provides evidence for organic evolution is ______. |
| A. | Archeopteryx between reptiles and mammals |
| B. | lung fish between pisces and reptiles |
| C. | duck billed platypus between reptiles and mammals |
| D. | Sphenodon between reptiles and birds |
| Answer» D. Sphenodon between reptiles and birds | |
| 3005. |
A study of evolution has established the systematic positions in many animals. In some animals chordate characters are absent in adult stage, but present in larval stage, eg. Herdmania has been included in ______. |
| A. | crustacea |
| B. | protochordata |
| C. | dermaptera |
| D. | onychophora |
| Answer» C. dermaptera | |
| 3006. |
Which one of the following terms would most correctly describe the relationship between the flightorgans of animals like locust, bat, swallow, and flying fish ? |
| A. | Atavism |
| B. | Analogous |
| C. | Homologous |
| D. | Vestigeal |
| Answer» C. Homologous | |
| 3007. |
Parallelism is ______. |
| A. | adaptive divergence |
| B. | adaptive convergence |
| C. | adaptive convergence of far off species |
| D. | adaptive convergence of closely related groups. |
| Answer» E. | |
| 3008. |
Coacervates were experimentally produced by ............. |
| A. | Sydney Fox and Oparin |
| B. | Fischer and Huxley |
| C. | Jacob and Monod |
| D. | Urey and Miller |
| Answer» E. | |
| 3009. |
Pick up the correct match_ans_key_I. Core of the earth A. Archaeozoic era_ans_key_II. Life originated B. Fe-Ni_ans_key_III. Stromatolites C. Inter-micromolecular assembly_ans_key_IV. TMC is an example D. Photosynthesizing algae |
| A. | I – B, II – A, III – D, IV – C |
| B. | I – A, II – B, III – C, IV – D |
| C. | I – B, II – D, III – C, IV – A |
| D. | I – A, II – B, III – D, IV – C |
| Answer» B. I – A, II – B, III – C, IV – D | |
| 3010. |
The diagram represents Miller experiment. Choose the correct combination of labelling. |
| A. | A – electrodes, B – NH3 + H2 + H2O + CH4, C – cold water, D – Vacuum, E – U trap |
| B. | A – electrodes, B – NH4 + H2 + CO2 + CH3, C – hot water, D – Vacuum, E – U trap |
| C. | A – electrodes, B – NH3 + H2O, C – hot water, D – tap, E – U trap |
| D. | A – electrodes, B – NH3 + H2 + H2O + CH4, C – steam, D – Vacuum, E – U trap |
| Answer» B. A – electrodes, B – NH4 + H2 + CO2 + CH3, C – hot water, D – Vacuum, E – U trap | |
| 3011. |
Mesozoic era is associated with mass extinction of ______. |
| A. | flowering plant |
| B. | trilobite |
| C. | Dodo |
| D. | dinosaurs |
| Answer» E. | |
| 3012. |
A. The first molecules formed for replicating cells were most probably RNA.R. This was proved by origin of ribozyme in 1987 by T. Cech in Tetrahymena. |
| A. | If A and R both are true and R is correct explanation of A |
| B. | If A and R both are true but R is not correct explanation of A |
| C. | If A is true and R is wrong |
| D. | If A is wrong and R is true |
| Answer» B. If A and R both are true but R is not correct explanation of A | |
| 3013. |
Urey and Miller in their experiment used a mixture of gases corresponding to primitive earth. Thesewere ______. |
| A. | C3, NH3, H2, CO2 |
| B. | O2, NH3, CH4, H2 |
| C. | NH3, CH4, H2O, CO2 |
| D. | CH4, NH3, H2, H2O |
| Answer» E. | |
| 3014. |
Evolutionary convergence is characterised by |
| A. | development of dissimilar characteristics in closely related groups |
| B. | development of a common set of characteristics in the groups of different ancestry |
| C. | development of characteristics by random mating |
| D. | replacement of common characteristics in different groups. |
| Answer» E. | |
| 3015. |
According to abiogenesis life originate from ______. |
| A. | non-living matter |
| B. | pre-exiting life |
| C. | chemicals |
| D. | extra-terrestrial matter |
| Answer» B. pre-exiting life | |
| 3016. |
Exhaust of motor vehicles produces pollutants like |
| A. | CO |
| B. | Hydrocarbons |
| C. | SO2 |
| D. | All of these |
| Answer» E. | |
| 3017. |
Measurement of ozone layer is done by ——— unit. |
| A. | Du |
| B. | Db |
| C. | Ds |
| D. | dv |
| Answer» B. Db | |
| 3018. |
Which is biodegradable pollutant? |
| A. | Mercury salt |
| B. | Polythene bags |
| C. | Domestic sewage |
| D. | Aluminum canes |
| Answer» D. Aluminum canes | |
| 3019. |
Which is the native place of Bishnoi community? |
| A. | Bikaner |
| B. | Jodhpur |
| C. | Jamshedpur |
| D. | Jaipur |
| Answer» C. Jamshedpur | |
| 3020. |
Which one of these has highest levels of DDT deposition? |
| A. | Eel |
| B. | Phytoplankton’s |
| C. | Sea gull, Eagle |
| D. | Crab |
| Answer» D. Crab | |
| 3021. |
Which is the main factor of water pollution? |
| A. | Ammonia |
| B. | Smog |
| C. | detergents |
| D. | None of these |
| Answer» E. | |
| 3022. |
Formation of ozone gas in upper layer depends on |
| A. | U V ray |
| B. | Infrared |
| C. | gamma rays |
| D. | rays. |
| Answer» B. Infrared | |
| 3023. |
The death of fishes due to Eutrophication is because of |
| A. | Increase O2 content |
| B. | Decrease CO2 content |
| C. | Decrease O2 content |
| D. | ) Increase CO2 content |
| Answer» D. ) Increase CO2 content | |
| 3024. |
What would have been the temperature of the earth without green house effect? |
| A. | -15° C |
| B. | -28° C |
| C. | -18°C |
| D. | -10°C |
| Answer» D. -10°C | |
| 3025. |
When huge amount of sewage is dumped in a river the BOD will |
| A. | Increase |
| B. | Decreases |
| C. | Remains same |
| D. | Drastic decrease |
| Answer» B. Decreases | |
| 3026. |
With the help of ____ SO2 is removed from the industrial exhaust? |
| A. | Electrostatic precipitator |
| B. | Solvents |
| C. | Scrubber |
| D. | None of these |
| Answer» D. None of these | |
| 3027. |
Match the items given in column I ,II and III_ans_key_Column-1 Column-II Column-III_ans_key_(P) Garhwal (i) Ramesh Dagar (a) Bishnoi Community_ans_key_(Q) Jodhpur (ii) Ahmad Khan (b) Chipako movement_ans_key_(R) Haryana (iii) Sunderlal Bahuguna (c) Polyblend_ans_key_(S) Bangalore (iv) Amruta Devi (d) Organic farming |
| A. | (p-iii |
| B. | , (q-iv-a), (r-i-d), (s-ii |
| C. | (B) ( p-i-a), (q-ii -b) ,(r-iii-c), (s-iv |
| Answer» B. , (q-iv-a), (r-i-d), (s-ii | |
| 3028. |
What do you understand by greenhouse effect? |
| A. | Increase in temperature due to increase in O2 concentration of the atmosphere |
| B. | Decrease in temperature due to decrease in O2 concentration of the atmosphere |
| C. | Increase in temperature due to increase in CO2 concentration of the atmosphere |
| D. | Decrease in temperature due to decrease in CO2 concentration of the atmosphere |
| Answer» D. Decrease in temperature due to decrease in CO2 concentration of the atmosphere | |
| 3029. |
In the water of flooded river what type of change is seen in BOD? |
| A. | Increase |
| B. | Decreases |
| C. | Remains same |
| D. | Drastic decrease |
| Answer» B. Decreases | |
| 3030. |
The Montreal protocol was made effective from.. |
| A. | 1987 |
| B. | 1989 |
| C. | 1976 |
| D. | 1986 |
| Answer» C. 1976 | |
| 3031. |
Amruta Devi Bishnoi Wild life Protection award has recently instituted for |
| A. | Extraordinary courage and dedication in protecting wildlife |
| B. | Extraordinary courage and dedication in protecting plants |
| C. | Extraordinary courage and dedication in protecting wild animals |
| D. | Extraordinary courage and dedication in Protecting Environment |
| Answer» B. Extraordinary courage and dedication in protecting plants | |
| 3032. |
What is importance of catalytic converter? |
| A. | They increases average of the vehicles |
| B. | They reduces emission of harmful gases |
| C. | They convert CO and nitric oxide into CO2 and H2O |
| D. | Both B and C |
| Answer» C. They convert CO and nitric oxide into CO2 and H2O | |
| 3033. |
The main problem arose due to green revolution is… |
| A. | Over production of food |
| B. | Water logging |
| C. | Soil salinity |
| D. | Both B and C |
| Answer» E. | |
| 3034. |
Formation of ozone hole is maximum over. .CBSE1997 |
| A. | Antarctica |
| B. | Europe |
| C. | Africa |
| D. | India |
| Answer» B. Europe | |
| 3035. |
In which sphere of atmosphere the ozone layer is seen? |
| A. | Troposphere |
| B. | Stratosphere |
| C. | Homosphere |
| D. | Thermosphere |
| Answer» C. Homosphere | |
| 3036. |
Deforestation may reduce the chances of…. (CBSE1990) |
| A. | Rain fall |
| B. | Frequent cyclones |
| C. | Erosion of surface soil |
| D. | Frequent landslide |
| Answer» B. Frequent cyclones | |
| 3037. |
The stress reaction is caused by |
| A. | Air pollution |
| B. | Nuclear pollution |
| C. | Water pollution |
| D. | Noise pollution |
| Answer» E. | |
| 3038. |
According to government of India’s new policy what should be the level of aromatic hydrocarbons of the concerned fuel? |
| A. | 40% |
| B. | 30% |
| C. | 42% |
| D. | 35% |
| Answer» D. 35% | |
| 3039. |
Which is the recommended depth to burry nuclear waste? |
| A. | 500mt |
| B. | 5000mts |
| C. | 600mts |
| D. | 50mts |
| Answer» B. 5000mts | |
| 3040. |
Biological treatment of water pollution can be done by |
| A. | Lichen |
| B. | Phytoplankton |
| C. | Algae |
| D. | None of these |
| Answer» C. Algae | |
| 3041. |
The release of phosphates and nitrates in lakes and ponds leads to |
| A. | Reduce algal growth |
| B. | Eutrophication |
| C. | Nutrient enrichment |
| D. | Both B and C |
| Answer» E. | |
| 3042. |
Which is the main pollutant content of domestic sewage? |
| A. | Biodegradable organic matter |
| B. | Biodegradable inorganic matter |
| C. | Flurohydro carbons |
| D. | Dissolve salts |
| Answer» B. Biodegradable inorganic matter | |
| 3043. |
Most severe environmental hazard to mankind is due to…. (DPMT1986) |
| A. | Air pollution |
| B. | Radioactive pollution |
| C. | Water pollution |
| D. | Noise pollution |
| Answer» C. Water pollution | |
| 3044. |
Bad ozone is formed in ——— layer of atmosphere ? |
| A. | Troposphere |
| B. | Stratosphere |
| C. | Thermosphere |
| D. | Ozonosphere |
| Answer» B. Stratosphere | |
| 3045. |
Name the disease caused by water pollution? |
| A. | Polio |
| B. | Typhoid |
| C. | Tuberculosis |
| D. | Leprosy |
| Answer» C. Tuberculosis | |
| 3046. |
Which disease is not caused by water pollution? |
| A. | Cholera |
| B. | Typhoid |
| C. | Tuberculosis |
| D. | Dysentery |
| Answer» D. Dysentery | |
| 3047. |
What is the average temperature of earth maintained by green house effect? |
| A. | 15°c |
| B. | 18°c |
| C. | 25°c |
| D. | 30°c |
| Answer» B. 18°c | |
| 3048. |
What are the reasons for soil erosion and desertification? |
| A. | Over cultivation |
| B. | Unrestricted grazing |
| C. | Deforestation |
| D. | All of these |
| Answer» E. | |
| 3049. |
.In the given chart of biological magnification what does a and b indicate? Fish eating birds-DDT -25ppm |
| A. | a=phytoplanktons,b=insects eating bird |
| B. | a= Zooplanktons , b=large fish Small fish-DDT - 0.5ppm |
| C. | a=DDT-0.03ppm,b=DDT-2ppm |
| D. | a=DDT-0.04ppb,b-DDT-2ppb Water- DDT -0.0003ppm |
| Answer» C. a=DDT-0.03ppm,b=DDT-2ppm | |
| 3050. |
What should be the forest cover recommended by National forest policy1988? |
| A. | 30% in plains and 76% in hill |
| B. | 33% in plains and 67% in hills |
| C. | 35% in plains and 76% in hills |
| D. | 22% in plains and 70%in hills |
| Answer» C. 35% in plains and 76% in hills | |