Tag: zoology
Questions Related to zoology
Which of the following decreases carbon dioxide levels in the atmosphere?
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Cellular Respiration
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Decomposition by bacteria
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Burning fossil fuels
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Photosynthesis
During Photosynthesis plants i.e. leaves take in carbon dioxide (CO2CO2) to make glucose. This reduces the carbon dioxide in the atmosphere. This is why trees, grasses, and algae all are solutions to global warming caused by excessive carbon dioxide (CO2CO2). All three of the other processes involve taking in oxygen (O2O2) and releasing carbon dioxide (CO2CO2), thus increasing the carbon dioxide in the atmosphere.
Which of the following applications use catalytic converters?
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Automobiles
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Wind mills
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Poultry farms
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Dairy farms
The method abatement of the pollution is generally adopted to reduce the sources of pollution and the impact and its consequences on the environment and health. There are techniques like the scrubbers, filters, etc., which reduce the emission of the harmful and toxic gases. The catalytic converters in automobiles are used to minimize the release of oxides of nitrogen and sulphur and unburnt hydrocarbons. This helps to reduce the air pollution.
Steps taken by the government of India to control air pollution include
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Compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel.
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Compulsory PUC (Pollution Under Control) certification of petrol driven vehicles which tests for carbon monoxide and hydrocarbons.
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Permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles.
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Use of non - polluting compressed Natural Gas (CNG) only as fuel by all buses and trucks.
The Supreme Court, under its directives, asked the government of India to switch over the entire fleet of public transport, i.e., buses, from diesel to compressed natural gas (CNG). Compressed natural gas (CNG) (methane stored at high pressure) can be used in place of gasoline (petrol), diesel fuel and propane/LPG. CNG combustion produces fewer undesirable gases than the fuels mentioned above. It is safer than other fuels in the event of a spill because natural gas is lighter than air and disperses quickly when released. CNG may be found above oil deposits or may be collected from landfills or wastewater treatment plants where it is known as biogas.
Gaseous pollutants can be controlled by
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Electrostatic precipitators
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Pyrolysis
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Incineration
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Adsorption
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None of the above
Adsorption is the phenomena where the atoms, ions or molecules from the gases, liquid and solids to a surface. It is a surface-based phenomenon and it easily absorbs the gas molecules and can reduce gaseous pollutants.
The pollution in city like Delhi may be controlled to great extent
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By proper sewage and proper exit of chemicals from factories
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By wide roads and factories away from the city
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By cleaning city and scanty use of pesticides
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All of the above
In modern times major types of pollution in urban areas are atmosphere, water and noise. Atmospheric pollution can be controlled to a large extent by location of factories and industries away from cities. Widening of roads will lead to less congestion, reduce idling time of engines of vehicles and ultimately be helpful in controlling atmospheric pollution due to vehicles. Sewage treatment plants and control on use of pesticides will reduce pollution of water bodies and prevent eutrophication of natural ponds and lakes. Clean city surroundings and proper waste disposal will reduce or eliminate breeding grounds of stray animals and disease spreading insect and non insect vectors.
Which of the following is the best measure to save energy?
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Each individual uses his own vehicle
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Four colleagues residing in the same colony travel to the office together by the same car
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Using vehicles to travel small distances
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Keeping the vehicle engine 'on' during traffic jam
- Conservation of energy is required to meet the increasing demand of growing population.
- One of the measures which can be taken is to reduce the use of the number of vehicles.
- Hereby, the fuel used by these automobiles will be less. When there are colleagues which live in the same colony or near to each other, the four people can use and travel to the office by using the same vehicle.
- This will reduce the amount of fuel required by vehicles of four people.
- Thus, the correct answer is option B.
Air entering lungs is $(1)$ Warmed $(2)$ Filtered $(3)$ Deprived of some oxygem $(4)$ Enriched with $CO _2$. What is true?
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$1, 2, 3$ and $4$
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$1$ and $2$
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$2$ and $4$
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$2$ and $3$
Photocatalysis of effluents is carried out with the help of
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Polymeric adsorbents
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Titanium dioxide
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Resins
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UV radiations
In coal fired power plants, electrostatic precipitators are fitted to control emission of
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$NO _x$
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CO
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SPM
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$SO _2$
The electrostatic precipitators work on the principles of the electrostatic force. It consists of discharge wires and collecting plates. An application of high voltage to the discharge wires create an electric field between the wires and the plates. When the air containing the dust and suspended particulate matter like aerosols and solid particles is passed through this electrostatic field, the particles get charged and are collected onto the plate as per Coulomb's Law. This makes the air free of dust and SPM. Electrostatic precipitators are used in vehicles and coal-fired power plant to restrict the entry of dust and SPM into the atmosphere
Air pollution is not reduced by
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Using precipitators
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Reusing wastes
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Cleaning air
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All of the above
Air pollution is caused by the release of harmful oxides of nitrogen, sulphur and carbon from the vehicular exhausts and industrial emissions primarily. Using precipitators allow the removal of dust from these emissions. Keeping the air clean by minimizing the combustion of fossil fuels, less use of vehicles, use of catalytic converters can help in reducing the air pollution. Reusing waste allows the minimal production of non-degradable waste. Hence, the correct answer is 'Reusing wastes'.