MCQ Question for Class 12 Biology Chapter 16 Environmental Issues

Check the below NCERT MCQ Class 12 Biology Chapter 16 Environmental Issues with Answers available with PDF free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest syllabus and examination pattern issued by CBSE, NCERT and KVS. Our teachers have provided below Environmental Issues Class 12 Biology MCQs Questions with answers which will help students to revise and get more marks in exams

Environmental Issues Class 12 Biology MCQs Questions with Answers

Refer below for MCQ Class 12 Biology Chapter 16 Environmental Issues with solutions. Solve questions and compare with the answers provided below

Question. A renewable exhaustible natural resource is   
(a) coal
(b) petroleum
(c) minerals
(d) forest.

Question. Montreal Protocol aims at 
(a) biodiversity conservation
(b) control of water pollution
(c) control of CO2 emission
(d) reduction of ozone depleting substances

Question. Climate of the world is threatened by   
(a) decreasing amount of atmospheric oxygen
(b) increasing amount of atmospheric carbon dioxide
(c) decreasing amount of atmospheric carbon dioxide
(d) increasing concentration of atmospheric oxygen.

Question. Phosphate pollution is caused by   
(a) sewage and phosphate rock
(b) sewage and agricultural fertilizers
(c) phosphate rock only
(d) agricultural fertilizers only.

Question. Major aerosol pollutant in jet plane emission is   
(a) sulphur dioxide
(b) carbon monoxide
(c) methane
(d) fluorocarbon

Question. Measuring Biochemical Oxygen Demand (BOD) is a method used for   
(a) estimating the amount of organic matter in sewage water
(b) working out the efficiency of oil driven automobile engines
(c) measuring the activity of Saccharomyces
cerevisiae in producing curd on a commercial scale
(d) working out the efficiency of RBCs about their capacity to carry oxygen.

Question. Which of the following pairs of gases is mainly responsible for greenhouse effect?
(a) Carbon dioxide and methane
(b) Ozone and ammonia
(c) Oxygen and nitrogen
(d) Nitrogen and sulphur dioxide

Question. Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?   
(a) Ammonia
(b) Methane
(c) Nitrous oxide
(d) Ozone

Question. Minerals and metals are     
(a) biodegradable resources
(b) renewable
(c) non-renewable
(d) renewable and non-renewable resources.

Question. Which of the following are most suitable indicators of SO2 pollution in the environment?   
(a) Algae
(b) Fungi
(c) Lichens
(d) Conifers

Question. Which of the following organism is likely to have more concentration of D.D.T. in its body?   
(a) Top carnivores
(b) Primary producers
(c) Herbivores
(d) Carnivores

Question. Most hazardous metal pollutant of automobile exhausts is   
(a) mercury
(b) cadmium
(c) lead
(d) copper.

Question. Formation of ozone hole is maximum over   
(a) Europe
(b) Africa
(c) India
(d) Antarctica.

Question. Which among the following is likely to have the highest levels of D.D.T. depositions in its body?   
(a) Sea gull
(b) Phytoplankton
(c) Eel
(d) Crab

Question. Which of the following is biodegradable pollutant? 
(a) Plastic
(b) Asbestos
(c) Sewage
(d) Polythene

Question. Deforestation causes 
(a) soil erosion
(b) soil pollution
(c) noise pollution
(d) air pollution

Question. The Air Prevention and Control of Pollution Act came into force in   
(a) 1985
(b) 1990
(c) 1975
(d) 1981

Question. The highest DDT concentration in aquatic food chain shall occur in   
(a) phytoplankton
(b) seagull
(c) crab
(d) eel.

Question. Which of the following is not one of the prime health risks associated with greater UV radiations through the atmosphere due to depletion of stratospheric ozone?   
(a) Damage to eyes
(b) Increased liver cancer
(c) Increased skin cancer
(d) Reduced immune system

Question. According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?   
(a) 1.0 or less
(b) 5.2 – 2.5
(c) 2.5 or less
(d) 1.5 or less

Question. DDT residues are rapidly passed through food chain causing biomagnification because DDT is   
(a) moderately toxic
(b) non-toxic to aquatic animals
(c) water soluble
(d) lipo soluble.

Question. Soil conservation is   
(a) conversion of sterile soil into fertile one
(b) aeration of soil
(c) erosion of soil
(d) protection against loss.

Question. Drinking of mineral water with very low level of pesticides (about 0.02 ppm) for long periods may
(a) produce immunity against mosquito 
(b) cause leukemia (blood cancer) in most people
(c) cause cancer of the intestine
(d) lead to accumulation of pesticide residues in body fat

Question. Lead concentration in blood is considered alarming if it is   
(a) 20 mg / 100 mL
(b) 30 mg / 100 mL
(c) 4 – 6 mg / 100 mL
(d) 10 mg / 100 mL.

Question. “Good ozone” is found in the   
(a) mesosphere 
(b) troposphere
(c) stratosphere
(d) ionosphere.

Question. Which of the following methods is the most suitable for disposal of nuclear waste?   
(a) Bury the waste within rocks deep below earth’s surface
(b) Shoot the waste into space
(c) Bury the waste under Antarctic ice-cover
(d) Dump the waste within rocks under ocean

Question. Which one of the following statements is correct?   
(a) Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants.
(b) Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and for plant nutrition in soil.
(c) At present it is not possible to grow maize without chemical fertilizers.
(d) Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies

Question. Fluoride pollution mainly affects   
(a) brain
(b) heart
(c) teeth
(d) kidney.

Question. The two gases making highest relative contribution to the greenhouse gases are   
(a) CO2 and CH4
(b) CH4 and N2O
(c) CFCs and N2O
(d) CO2 and N2O.

Question. High value of BOD (Biochemical Oxygen Demand) indicates that   
(a) water is less polluted
(b) consumption of organic matter in the water is higher by the microbes
(c) water is pure
(d) water is highly polluted.

Question. The supersonic jets cause pollution by the thinning of 
(a) O2 layer
(b) O3 layer
(c) CO2 layer
(d) SO2 layer.

Question. Joint Forest Management Concept was introduced in India during   
(a) 1980s
(b) 1990s
(c) 1960s
(d) 1970s.

Question. Greenhouse effect is warming due to   
(a) infra-red rays reaching earth
(b) moisture layer in atmosphere
(c) increase in temperature due to increase in
carbon dioxide concentration of atmosphere
(d) ozone layer of atmosphere

Question. The two great industrial tragedies namely, MIC and Chernobyl tragedies respectively occurred where and at which time?   
(a) Bhopal 1984, Ukraine 1986
(b) Bhopal 1986, Russia 1988
(c) Bhopal 1984, Ukraine 1990
(d) Bhopal 1984, Ukraine 1988

Question. Which of the following is absent in polluted water?   
(a) Hydrilla
(b) Water hyacinth
(c) Larva of stone fly
(d) Blue green algae

Question. Maximum greenhouse gas released by which of the following country? 
(a) India
(b) France
(c) USA
(d) Britain

Question. The Taj Mahal is threatened due to the effect of 
(a) oxygen
(b) hydrogen
(c) chlorine
(d) sulphur dioxide.

Question. Which of the following statements about ozone is correct?   
(a) Tropospheric ozone protects us from UV radiations.
(b) Stratospheric ozone is ‘bad’.
(c) Tropospheric ozone is ‘good’.
(d) Stratospheric ozone protects us from UV radiations.

Question. If we uncover half of the forest covering the earth, what crisis will be produced at most and at first?   
(a) Some species will be extinct.
(b) Population and ecological imbalance will rise up.
(c) Energy crisis will occur.
(d) Rest half forests will maintain this imbalance

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