Management of Natural Resources Test - 9

Afforestation is the natural or intentional restocking of existing forests and woodlands that have been depleted, usually through deforestation

Silicosis is a lung disease caused by breathing in tiny bits of silica, a mineral that is part of sand, rock, and mineral ores such as quartz. It mostly affects workers exposed to silica dust in occupations such mining, glass manufacturing, and foundry work.

The upflow anaerobic sludge blanket reactor (UASB) is a single tank process. Wastewater enters the reactor from the bottom, and flows upward. A suspended sludge blanket filters and treats the wastewater as the wastewater flows through it

Disadvantages of construction of dams are:

Environmental problems:The construction of dams across rivers leads to deforestation, which results in the loss of biodiversity. This creates a disturbance in the natural ecosystem.

Social problems:The construction of dams involves the building of large reservoirs. In some cases, constructing a reservoir may result in the flooding of nearby towns and villages. A large number of people are displaced as a direct consequence of the construction of reservoirs. In such cases, the government rehabilitates the people of these areas, which in itself is a huge task.

Economic problems:The construction of dams requires huge amounts of monetary investments. A dam does not become profitable until it starts generating electricity.

As a result of all these problems, there is a strong opposition to the construction of large dams. The opposition to the construction of theTehri damover the river Ganga and theNarmada Bachao Andolan(a protest against the proposed increase in the height of the Sardar Sarovar Dam over the river Narmada) are examples of such opposition

A neutral pH is most conducive for living beings in freshwater. The pH range 6.5-7.5 nearest to neutral.

Statement A is false because

The combining capacity of carbon monoxide with haemoglobin is more than 100 times faster than oxygen.

Statement B is true is because Electrostatic precipitator, also called electrostatic air cleaner, is a device that uses an electric charge to remove certain impurities.

Byssinosis, also called "brown lung disease" or "Mondayfever", is an occupational lung disease caused by exposure to cotton dust in inadequately ventilated working environments.

Statement A is true because: Through advances in recycling technology we can recycle metals, plastics and paper.  And it's a good thing because we need to conserve as much of our resources as possible.

Statement B is false because Bioaccumulation can happen with harmful chemicals as well.

Bioaccumulation is the gradual build up over time of a chemical in a living organism. This occurs either because the chemical is taken up faster than it can be used, or because the chemical cannot be broken down for use by the organism (that is, the chemical cannot be metabolized).

Bioaccumulation need not be a concern if the accumulated compound is not harmful. Compounds that are harmful to health, such as mercury, however, can accumulate in living tissues.

A natural resource is anything that people can use which comes from the natural environment. People do not make natural resources, but gather them. Examples of natural resources are air, water, wood, oil, wind energy, iron, and coal. Refined oil and hydro-electric energy are not natural resources because people make them.

Chlorofluorocarbons (CFCs) are anthropogenic compounds that have been released into the atmosphere since the 1930s in various applications such as in air-conditioning, refrigeration, blowing agents in foams, insulations and packing materials, propellants in aerosol cans, and as solvents.

Automobile discharge is the source of Hydrocarbons. These pollutants react with nitrogen oxides in the presence of sunlight to form ground level ozone, a primary ingredient in smog.