Free Man and His Environment MCQs with Answers
382 Man and His Environment MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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Read the Man and His Environment notesFree MDCAT chapter notes with key terms382 questions · page 13 of 20
- A. Gases like sulphur dioxide.
- B. Particulate matter of the size 5 micrometer or above.
- C. Gases like ozone and methane.
- D. Particulate matter of the size 2.5 micrometer or less.
Explanation: Dust separation is carried out by scrubbers. They are of two types, dry and wet.
Correct answer: Gases like sulphur dioxide.- A. CoP - 6
- B. CoP - 4
- C. CoP - 3
- D. CoP - 5.
Explanation: Kyoto protocol is an international treaty to reduce emission of greenhouse gases which was adopted at the third session of the Conference…
Correct answer: CoP - 3- 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.
Explanation: Carbon dioxide is a greenhouse gas with a warming effect of 60%. Greenhouse gases are essential for keeping the earth warm and hospitable.
Correct answer: Increasing amount of atmospheric carbon dioxide.- A. Birds stopped laying eggs.
- B. Earthworms in the area got eradicated.
- C. Cobras were feeding exclusively on birds.
- D. Many of the birds eggs laid, did not hatch.
Explanation: Higher amounts of DDT disturb calcium metabolism of birds resulting in thinning of egg shells and their premature breaking that kills the…
Correct answer: Many of the birds eggs laid, did not hatch.- A. Most of the forests have been lost in tropical areas.
- B. Ozone in upper part of atmosphere is harmful to animals.
- C. Greenhouse effect is a natural phenomenon.
- D. Eutrophication is a natural phenomenon in freshwater bodies.
Explanation: Ozone present in upper atmosphere forms a distinct layer that is known as ozone layer.
Correct answer: Ozone in upper part of atmosphere is harmful to animals.- 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.
Explanation: Biochemical oxygen demand (BOD) is the amount of oxygen taken up by microorganisms that decompose organic waste matter in water.
Correct answer: Estimating the amount of organic matter in sewage water.- A. Deserts
- B. Fresh water lakes
- C. Ocean
- D. Mountains
Explanation: Eutrophication is the excessive growth of algae, plants and animals in water bodies due to the nutrient enrichment particularly with…
Correct answer: Fresh water lakes- A. Mesosphere
- B. Troposphere
- C. Stratosphere
- D. Ionosphere
Explanation: Bad ozone is formed in the lower atmosphere (troposphere) that harms plants and animals.
Correct answer: Stratosphere- A. Coal
- B. Petroleum
- C. Minerals
- D. Forest
Explanation: Exhaustible resources are those natural resources which are likely to be exhausted or diminished as a result of their continuous use.
Correct answer: Forest- A. Small animals like rats will die after drinking river water.
- B. The increased microbial activity releases micronutrients such as iron.
- C. The increased microbial activity uses up the dissolved oxygen.
- D. The river water is still suitable for drinking as impurities are only about 0.1%.
Explanation: When sewage mixes with a water body, microorganisms present in it biodegrade the organic matter of the sewage using oxygen.
Correct answer: The increased microbial activity uses up the dissolved oxygen.- A. Montreal Protocol
- B. Kyoto Protocol
- C. Vienna Convention
- D. Rio de Janeiro Conference
Explanation: The Montreal Protocol was signed in Montreal, Canada, by over 150 countries at a convention in 1987 to cut the use of CFCs (chlorofluoro…
Correct answer: Montreal Protocol- A. Has no relationship with concentration of oxygen in the water.
- B. Gives a measure of Salmonella in the water.
- C. Increases when sewage gets mixed with river water.
- D. Remains unchanged when algal bloom occurs.
Explanation: Biochemical oxygen demand (BOD) is the amount of oxygen taken up by microorganisms that decompose organic waste matter in water.
Correct answer: Increases when sewage gets mixed with river water.- A. Conserve biodiversity
- B. Control water pollution
- C. Control CO2 emissions
- D. Reduce the use of ozone depleting substances
Explanation: The Montreal Protocol was signed in Montreal, Canada, by over 150 countries at a convention in 1987 to cut the use of CFCs (chlorofluoro…
Correct answer: Reduce the use of ozone depleting substances- A. Moderately toxic
- B. Non-toxic to aquatic animals
- C. Water soluble
- D. Liposoluble
Explanation: Biomagnification is caused by non-degradable pollutants like DDT. Heavy metals and persistent pesticides (e.g., organochlorine or…
Correct answer: Liposoluble- A. 1.0 or less
- B. 2.5-5.2
- C. 2.5 or less
- D. 1.5 or less
Explanation: Particulate matter consists of soot, fly ash, dust, spores, pollen grains etc.
Correct answer: 2.5 or less- A. NO X
- B. SPM
- C. CO
- D. SO 2
Explanation: SPM is suspended particulate matter which is less than 10 mm remaining in air for more than one day to several weeks.
Correct answer: SPM- A. PAN (peroxyacyl nitrate)
- B. Ozone
- C. Nitrogen dioxide
- D. Carbon dioxide
Explanation: Photochemical smog is a complex type of air pollution primarily formed through chemical reactions involving pollutants released into the…
Correct answer: Carbon dioxide- A. 1985
- B. 1986
- C. 1987
- D. 1988
Explanation: The Montreal protocol was signed in Montreal, Canada, by over 150 countries at a convention in 1987 to cut use of CFCs (chlorofluoro…
Correct answer: 1987- A. Acidity
- B. Aridity
- C. Salinity
- D. Metal toxicity
Explanation: Irrigation induced salinity can arise as a result of the use of any irrigation water, irrigation of saline water etc.
Correct answer: Salinity- A. Chlorine
- B. Ozone
- C. Chlorine dioxide
- D. Phenyl
Explanation: Chlorine is one of the most widely used disinfectants for water treatment.
Correct answer: Phenyl