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 15 of 20
- A. Mammals and biosphere
- B. Mammals and biology programme
- C. Man and biology programme
- D. Man and biosphere programme.
Explanation: The man and biosphere programme is an international biological programme of UNESCO (United Nations Educational Scientific and Cultural…
Correct answer: Man and biosphere programme.- A. Sewage and phosphate rock.
- B. Sewage and agricultural fertilizers.
- C. Phosphate rock only.
- D. Agricultural fertilizers only.
Explanation: Phosphate pollution is indeed primarily caused by the release of phosphates into the environment from various sources, with sewage and…
Correct answer: Sewage and agricultural fertilizers.- A. Some species will be extinct
- B. Population and ecological imbalance will rise up
- C. Energy crisis will occur
- D. The remaining forests will maintain this imbalance.
Explanation: Deforestation will affect the earth in different ways. Due to destruction of natural habitats, many species will get extinct.
Correct answer: Some species will be extinct- A. 200 times
- B. 1000 times
- C. 2 times
- D. 20 times
Explanation: Carbon monoxide is produced due to incomplete combustion, metallurgical operations and naturally by plants as well as animals.
Correct answer: 200 times- A. Phosphorus-32
- B. Strontium-90
- C. Cesium-137
- D. Iodine-131
Explanation: Strontium-90 (Sr-90) is a radioactive isotope of strontium, and it is indeed considered dangerous due to its potential health risks…
Correct answer: Strontium-90- A. Fluorine
- B. Boron
- C. Mercury
- D. Chlorine
Explanation: The dental disease characterized by mottling of teeth is known as "dental fluorosis." It is caused by the excessive presence of the…
Correct answer: Fluorine- A. Over-grazing
- B. Tourism
- C. Irrigated agriculture
- D. All of these
Explanation: Desertification means a process of spread of desert that occurs due to degradation of environment, cutting of trees, soil erosion etc.
Correct answer: Over-grazing288. 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
Explanation: DDT is non-biodegradable and is not metabolized within the body of an organism rather it accumulates in the fat tissues therefore its…
Correct answer: Sea gull- A. Above 80 dB
- B. Above 30 dB
- C. 50 dB
- D. 20 dB
Explanation: The level at which sounds are considered hazardous noise pollution depends on both the intensity of the sound and the duration of…
Correct answer: Above 80 dB- A. Fluorides
- B. Carbon monoxide
- C. Sulphur dioxide
- D. Ozone
Explanation: Ozone is generated in the lower atmosphere during the formation of photochemical smog when nitrogen dioxide splits to produce reactive…
Correct answer: Ozone- A. Mercury
- B. Cadmium
- C. Lead
- D. Copper
Explanation: Lead (Pb) is released by the combustion of petrol because tetraethyl lead is used as an antiknocking agent in petrol.
Correct answer: Lead- A. Biodegradable resources.
- B. Renewable resources.
- C. Non-renewable resources.
- D. Renewable and non-renewable resources.
Explanation: Minerals and metals are generally considered non-renewable resources, meaning that they are finite and cannot be replaced on a human…
Correct answer: Non-renewable resources.- A. Non-biodegradable pollution.
- B. Biodegradable pollution.
- C. Effluents
- D. Air pollution
Explanation: Domestic waste constitutes biodegradable pollution. These are also called non-conservative pollutants.
Correct answer: Biodegradable pollution.- A. Sulphur dioxide
- B. Carbon monoxide
- C. Methane
- D. Fluorocarbon
Explanation: Aerosols are chlorofluoro-hydrocarbon compounds released into the air with force in the form of vapour.
Correct answer: Fluorocarbon- A. Soil erosion
- B. Land slides
- C. Soil fertility
- D. Rainfall
Explanation: Deforestation will affect the earth in different ways. Due to destruction of natural habitats, many species will get extinct.
Correct answer: Rainfall- A. Conversion of sterile soil into fertile soil
- B. Aeration of soil
- C. Erosion of soil
- D. Protection against loss of soil
Explanation: Soil conservation is to conserve fertile soil from losses like heavy rainfall, drainage, high wind, flood, drought etc.
Correct answer: Protection against loss of soil- A. Nitrogenase
- B. Nitroreductase
- C. Transferase
- D. Transaminase.
Explanation: The correct enzyme used in the process of nitrogen fixation is "nitrogenase." Nitrogenase is the enzyme responsible for catalyzing the…
Correct answer: Nitrogenase- A. 15 trillion
- B. 6 billion
- C. 500 million
- D. 100 million
Explanation: As this question appeared in 1997, so the population of world in mid 1997 was 5, 840, 324, 240 i.e., approximately 6 billion.
Correct answer: 6 billion- A. Absence of air pollution
- B. Nutrient content of the area
- C. Rich biodiversity of the area
- D. Beginning of ecosystem degradation
Explanation: Lichens are bioindicators that can provide information about the environmental conditions of an area.
Correct answer: Absence of air pollution- A. Zoo garden
- B. National park
- C. Botanical garden
- D. Wildlife corridors
Explanation: The ideal place for the conservation and protection of snow leopards is a national park.
Correct answer: National park