CBSE Class 12 Biology Environmental Issues MCQs Set B

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

Answer : D

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

Answer : D

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

Answer : D

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

Answer : D

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

Answer : A

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

Answer : B

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

Answer : D

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

Answer : A

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

Answer : D

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

Answer : A

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

Answer : D

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.

Answer : D

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.

Answer : B

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

Answer : B

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

Answer : A

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

Answer : D

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

Answer : B

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.

Answer : D

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.

Answer : A

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.

Answer : B, D

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

Answer : D

Question. The supersonic jets cause pollution by the thinning of
(a) O₂ layer
(b) O₃ layer
(c) CO₂ layer
(d) SO_{2 l}ayer.

Answer : B

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

Answer : A

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

Answer : D

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

Answer : D

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

Answer : D

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.

Answer : B

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

Answer : D

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

Answer : D

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

Answer : D

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

Answer : D

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

Answer : D

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

Answer : A

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

Answer : D

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

Answer : A

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

Answer : D