Chemistry
Grade-6
Easy
Question
Which of the following statements is correct?
i. The less burning of fuels leads to a larger amount of greenhouse gases being emitted.
ii. Organic agriculture is not entirely emission-free, but the amount of pollutants is lower.
iii. Trees are not only natural air filters, but they also cool down summer temperatures by a few degrees.
(i)
(ii)
(iii)
True
True
False
(i)
(ii)
(iii)
True
False
True
(i)
(ii)
(iii)
False
True
True
(i)
(ii)
(iii)
False
True
True
| (i) | (ii) | (iii) |
| True | True | False |
| (i) | (ii) | (iii) |
| True | False | True |
| (i) | (ii) | (iii) |
| False | True | True |
| (i) | (ii) | (iii) |
| False | True | True |
Hint:
When fossil fuels burn, large amounts of carbon dioxide, a greenhouse gas, are released into the atmosphere.
The correct answer is:
(i)
(ii)
(iii)
False
True
True
The statement " Organic agriculture is not entirely emission-free, but the amount of pollutants is lower", and "Trees are not only natural air filters, but they also cool down summer temperatures by a few degrees" are correct.
Organic farming discourages the use of aggressive chemicals in general and contributes to the protection of the natural environment. In fact, research studies show that organic farming saves about half a billion pounds of pesticides and chemicals from entering the environment each year.
Trees engage in a process known as evapotranspiration, cooling their leaves and the surrounding air through latent heat exchange. Vegetation extracts heat from its core and converts it to release water vapor instead of storing it. It also has a low albedo (a measure of light used in architecture), so the sun's rays are absorbed by the leaf surface instead of being reflected.
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The most important cause of air pollution is:
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The correction of is c)Burning fossils fuels.
- Air pollution is a mixture of harmful substances from man-made and natural sources. Motor vehicle emissions, fuel oil and natural gas used to heat homes, by-products of manufacturing and power generation, especially coal-fired power plants, and smoke from chemical manufacturing are the main sources of anthropogenic air pollution.
- When fossil fuels burn, nitrogen oxides are released into the atmosphere, contributing to the formation of smog and acid rain. The most common nitrogen compounds released into the atmosphere by human activities are collectively called nitrogen oxides.
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Burning of fossils fuels like petrol, and diesel causes:
The correct option is a)Global warming.
- Fossil fuels are formed by the decomposition of buried carbon-based organisms that died millions of years ago.
- They create carbon-rich deposits that are decomposed and burned for energy. They are non-renewable and currently provide about 80% of the world's energy.
- They are also used in the production of plastics, steel and various products. Fossil fuels include his three types: coal, oil and gas.
- When fossil fuels burn, large amounts of carbon dioxide, a greenhouse gas, are released into the atmosphere. Greenhouse gases trap heat in the atmosphere, causing global warming.
- The average global temperature has already increased by 1°C. Temperatures above 1.5°C increase the risk of sea level rise, extreme weather conditions, biodiversity loss, species extinction, food insecurity, and worsening health and poverty for millions of people worldwide. .
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The correct option is a)Global warming.
- Fossil fuels are formed by the decomposition of buried carbon-based organisms that died millions of years ago.
- They create carbon-rich deposits that are decomposed and burned for energy. They are non-renewable and currently provide about 80% of the world's energy.
- They are also used in the production of plastics, steel and various products. Fossil fuels include his three types: coal, oil and gas.
- When fossil fuels burn, large amounts of carbon dioxide, a greenhouse gas, are released into the atmosphere. Greenhouse gases trap heat in the atmosphere, causing global warming.
- The average global temperature has already increased by 1°C. Temperatures above 1.5°C increase the risk of sea level rise, extreme weather conditions, biodiversity loss, species extinction, food insecurity, and worsening health and poverty for millions of people worldwide. .
