12th Grade > Biology
ENVIRONMENTAL ISSUES MCQs
Total Questions : 38
| Page 3 of 4 pages
Answer: Option A. -> True
:
A
Irreparable computers and other electronic goods are known as electronic wastes (e-wastes). E-wastes are buried in landfills or incinerated. Over half of the e-wastes generated in the developed world are exported to developing countries, mainly to China, India and Pakistan, where metals like copper, iron, silicon, nickel and gold are recovered during the recycling process. Eventually recycling is the only solution for the treatment of e-wastes, provided it is carried out in an eco-friendly manner.
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:
A
Irreparable computers and other electronic goods are known as electronic wastes (e-wastes). E-wastes are buried in landfills or incinerated. Over half of the e-wastes generated in the developed world are exported to developing countries, mainly to China, India and Pakistan, where metals like copper, iron, silicon, nickel and gold are recovered during the recycling process. Eventually recycling is the only solution for the treatment of e-wastes, provided it is carried out in an eco-friendly manner.
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Answer: Option A. -> Joint Forest Management
:
A
Recognising the significant participation of local communities in the protection of forests, the Government of India introduced the concept of Joint Forest Management (JFM) in the 1980s so as to work closely with the local communities for protecting and managing forests. In return for their services to the forest, the communities benefit from various forest products like fruits, gum, rubber, medicine, etc. and thus, the forest can be conserved in a sustainable manner.
:
A
Recognising the significant participation of local communities in the protection of forests, the Government of India introduced the concept of Joint Forest Management (JFM) in the 1980s so as to work closely with the local communities for protecting and managing forests. In return for their services to the forest, the communities benefit from various forest products like fruits, gum, rubber, medicine, etc. and thus, the forest can be conserved in a sustainable manner.
Answer: Option A. -> Deforestation
:
A
Slash and burn agriculture, commonly called as Jhum cultivation in the north-eastern states of India, has contributed to deforestation. In slash and burn agriculture, the farmers cut down the trees of the forest and burn the plant remains and the land is used for farming. After cultivation, the area is left alone for several years so as to allow its recovery. The farmers then move on to other areas and repeat this process.With increasing populationand repeated cultivation, this recovery phase is done away with, resulting in deforestation.
:
A
Slash and burn agriculture, commonly called as Jhum cultivation in the north-eastern states of India, has contributed to deforestation. In slash and burn agriculture, the farmers cut down the trees of the forest and burn the plant remains and the land is used for farming. After cultivation, the area is left alone for several years so as to allow its recovery. The farmers then move on to other areas and repeat this process.With increasing populationand repeated cultivation, this recovery phase is done away with, resulting in deforestation.
Answer: Option B. -> False
:
B
Apart from oil spills, non-biodegradable waste from land can also be a major cause of pollution in ocean water. The best example of that is the ‘Great Pacific Garbage Patch’. This huge garbage patch in the Pacific Ocean is made of microparticles of waste that have come from North America, Japan and East Asian countries.
:
B
Apart from oil spills, non-biodegradable waste from land can also be a major cause of pollution in ocean water. The best example of that is the ‘Great Pacific Garbage Patch’. This huge garbage patch in the Pacific Ocean is made of microparticles of waste that have come from North America, Japan and East Asian countries.
Answer: Option B. -> Both A and R are true but R is not the correct explanation of A
:
B
Carbon dioxide is an important greenhouse gas and it is necessary that it is present in the correct amountsin the atmosphere so that the normal temperature of the earth is maintained. Trees are mostly responsible for maintaining balancedcarbon dioxide levels on earth. However, due to increased deforestation, thecarbon dioxidelevels have been continually rising as there are not enough trees to ultilise the excesscarbon dioxide emitted from our automobiles, industriesetc. While carbon dioxide is the major contributor to global warming, methane and CFCs are other greenhouse gases which also contribute to it.
:
B
Carbon dioxide is an important greenhouse gas and it is necessary that it is present in the correct amountsin the atmosphere so that the normal temperature of the earth is maintained. Trees are mostly responsible for maintaining balancedcarbon dioxide levels on earth. However, due to increased deforestation, thecarbon dioxidelevels have been continually rising as there are not enough trees to ultilise the excesscarbon dioxide emitted from our automobiles, industriesetc. While carbon dioxide is the major contributor to global warming, methane and CFCs are other greenhouse gases which also contribute to it.
Answer: Option D. -> All of the above
:
D
Sustainable farming is the production of high quality food, fibre or other plant or animal products using farming techniques that protect the environment, public health, human communities and animal welfare.
:
D
Sustainable farming is the production of high quality food, fibre or other plant or animal products using farming techniques that protect the environment, public health, human communities and animal welfare.
Answer: Option D. -> All of these
:
D
Radioactive pollutioncan be defined as the type of pollution caused by the release ofradioactivesubstances or high energy particles into air, water, or earth as a result of human activity, either by accident or by design.These sources include mining and refining of radioactive elements, production and explosion of nuclear weapons, nuclear power plants, improper disposal of nuclear wastes and preparation of radioactive isotopes.
:
D
Radioactive pollutioncan be defined as the type of pollution caused by the release ofradioactivesubstances or high energy particles into air, water, or earth as a result of human activity, either by accident or by design.These sources include mining and refining of radioactive elements, production and explosion of nuclear weapons, nuclear power plants, improper disposal of nuclear wastes and preparation of radioactive isotopes.
Answer: Option A. -> (i) Nitrogen (ii) oxygen (iii) carbon dioxide (iv) argon (v) water vapour
:
A
The atmosphere is a mixture of gases with 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.93% argon and small amounts of other gases. Air also contains variable amounts of water vapour, on an average around 1% at sea level and 0.4% over the entire atmosphere.
:
A
The atmosphere is a mixture of gases with 78% nitrogen, 21% oxygen, 0.03% carbon dioxide, 0.93% argon and small amounts of other gases. Air also contains variable amounts of water vapour, on an average around 1% at sea level and 0.4% over the entire atmosphere.
Answer: Option D. -> Goitre - Lead poisoning
:
D
Minamata disease is a case of mercury poisioning that happened in Japan. Fluoridepoisoning of groundwater and drinking water causes skeletal and dental fluorosis. Arsenic poisoning as a result of groundwater contamination causes skin disease, gangrene and cancer. Goitre is a case of iodine deficiency. Lead poisoning usually occurs over a period of months or years. It can cause severe mental and physical impairment. Young children are most vulnerable.
:
D
Minamata disease is a case of mercury poisioning that happened in Japan. Fluoridepoisoning of groundwater and drinking water causes skeletal and dental fluorosis. Arsenic poisoning as a result of groundwater contamination causes skin disease, gangrene and cancer. Goitre is a case of iodine deficiency. Lead poisoning usually occurs over a period of months or years. It can cause severe mental and physical impairment. Young children are most vulnerable.
Answer: Option D. -> All of the above
:
D
Sterile Insect Technique (SIT) is a process by which sterile male pests are introduced into the pest population to trick females into unsuccessful breeding encounters, providing a form of birth control and reducing reproduction rates.
Gene transfer techniques can help produce modified plants which have been pre loaded with target-specific toxins, which will be toxic to only the targeted pest and no other form of life. B Gene introduced into the cotton plant to combat the cotton bollworm is one such example.
Natural pesticides are naturally occurring compounds from plants, animals, fungi and bacteria, which can act as pesticides. Many serve as repellents whereas some are toxic, though only to a narrow range of related pest species. Examples include citronella oil, garlic oil, neem oil, pongamia oil etc.
:
D
Sterile Insect Technique (SIT) is a process by which sterile male pests are introduced into the pest population to trick females into unsuccessful breeding encounters, providing a form of birth control and reducing reproduction rates.
Gene transfer techniques can help produce modified plants which have been pre loaded with target-specific toxins, which will be toxic to only the targeted pest and no other form of life. B Gene introduced into the cotton plant to combat the cotton bollworm is one such example.
Natural pesticides are naturally occurring compounds from plants, animals, fungi and bacteria, which can act as pesticides. Many serve as repellents whereas some are toxic, though only to a narrow range of related pest species. Examples include citronella oil, garlic oil, neem oil, pongamia oil etc.
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