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Published on: 02/06/2021
QB365 provides detailed and simple solution for every book back questions in class 12 Biology subject.It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
How does recycling help reduce pollution?
2.
How does forest conservation help to reduce air pollution?
3.
In what way Peyang conserves the forest?
4.
What is the primary purpose of the Kyoto Protocol?
5.
What are some solutions to toxic dumping in our oceans?
1.
1. Recycling prevents emissions of many greenhouse gases and water pollutants, and saves energy.
2. Using recovered material generates less solid waste.
3. Recycling helps to reduce the pollution caused by the extraction and processing of virgin materials
2.
(i) The alteration or changes in the composition of the earth's atmosphere by natural or human activities is called air pollution.
(ii) Increase in carbon dioxide concentration of air is also a form of air pollution. The normal CO2 concentration in the atmosphere is only about 0.03%. Deforestation is one of the major contributions for increase in carbon dioxide of the air. Forests act as carbon sink by utilizing the atmospheric carbon dioxide for photosynthesis.
(iii) When forests are cut down, the concentration of the atmosphere increases. This leads to global warming or greenhouse effect which is an effect of air pollution.
(iv) Thus by forest conservation, we can reduce the carbon footprint by increased trapping of atmospheric CO2 and thereby reducing global warming. This leads to reduced levels of air pollution.
3.
The 'Forest man of India', Jadav Payeng who created 1,360 acres of dense and defiant forest was born in Arunasapori (a river island on the Brahmaputra). He had just completed his Class X exams in 1979 when he started to sow the seeds and shoots on the eroded island covered with sand and silt. Thirty-six years later he had converted the once unproductive land into a forest. Payeng's forest is now home to five Royal Bengal tigers, over a hundred deer, wild boar, vultures, and several species of birds. For his remarkable initiative, the Jawaharlal Nehru University invited Payeng in 2012 on Earth Day and honored him with the title of the 'Forest Man of India'. Later, the President APJ Abdul Kalam felicitated him with a cash award in Mumbai. The same year, he received the 'Padma Shri'.
4.
The main goal of the Kyoto protocol is to control emissions of the main Anthropogenic (human-emitted) greenhouse gases (GHGs) in ways that reflect underlying national difference in GHG emission, wealth and capacity to make the reductions.
5.
1. Farmers need to be made aware about organic farming which does not require any kind of fertilizers and pesticides usage.
2. Crop rotation can be practiced by farmers which reduces the need for fertilizers and improves the fertility of the soil.
3. Ships and tankers that carry oil can be supervised earlier and ensured that they are not damaged in any way and through this oil will not be split in the ocean water.
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Tamilnadu Stateboard 12th Standard Subjects

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Chemistry

Physics

Biology

Computer Science

Business Maths and Statistics

Economics

Commerce

Accountancy

History

Computer Applications

Biology

Computer Technology

Computer Applications

Computer Science

Business Maths and Statistics

Commerce

Economics

Maths

Chemistry

Physics

Computer Technology

History

Accountancy

Tamil

English

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