Tag: the environment and us
Questions Related to the environment and us
Concentration of green house gases is increasing due to
-
Deforestation
-
Increased use of refrigerators
-
Increased combustion of coal and petroleum
-
All of the above
The greenhouse gases are capable of trapping and reflecting the sun's radiations on the earth's surface. Examples include carbon dioxide, methane, nitrous oxides etc. These are naturally released by activities like volcanic eruptions, forest fires, respiration etc. But their increased levels have occurred due to the anthropogenic activities like deforestation, increased use of refrigerators (releasing CFCs) and increased combustion of coal and petroleum (releasing oxides of nitrogen, sulphur and carbon). Because of the increase in their levels, they have caused climate change by global warming.
A successful forest conservation strategy should involve
-
protection of animals at the highest trophic level
-
protection of only sonsumers
-
protection of only herbivores
-
comprehensive programme to protect all the physical and biological components
Many marine animals use carbonates dissolved in sea-water to make their shells. Which of the following component is reduced in our atmosphere by this biological phenomenon?
-
Oxygen
-
Calcium carbonate
-
Carbon dioxide
-
Nitrogen
Shell of many marine organism are made of calcium carbonate. Carbonate is formed when carbon dioxide (CO2) from atmosphere get react with the sea water. It also help us to maintain carbon dioxide level in the atmosphere because today scenario is very alarming due to increasing level of carbon dioxide.
Major causes of air pollution are:
-
Combustion of natural gas, coal, petroleum
-
Welding, stone crushing, agriculture burning
-
Both A and B
-
None of the above
Major causes of air pollution are combustion of natural gas, coal, petroleum, automobiles, aircraft, railways, thermal plants, welding, stone crushing and agriculture burning
Which of the following pollution involves eutrophication?
-
Water pollution
-
Noise pollution
-
Air pollution
-
None of the above
The direct discharge of pollutants into water bodies leads to
-
Water pollution
-
Soil pollution
-
Air pollution
-
All of the above
Water pollution is the mixing of contaminants to the water bodies (e.g., lakes, rivers, oceans, aquifers and groundwater) which changes the desired quality of water. Water pollution affects the entire biosphere, plants and organisms living in these bodies of water.
Water pollution causes damage to the
-
Humans only
-
Entire ecosystem
-
Plants only
-
None of the above
Water pollution affects the entire biosphere, plants and organisms as all the life forms depend on water for their survival. In almost all cases, the effect is damaging not only to individual species and population but also to the natural biological communities.
The unfavourable alteration of environment due to human activities is termed as
-
Ecological disturbance
-
Catastrophe
-
Ecological degradation
-
Pollution
Pollution is the addition of contaminants into the natural environment that can cause undesirable change. It may be the chemical and physical change. Pollutants are the contaminants that cause pollution.
Fine organic or inorganic particles suspended in air is called as
-
Particulate pollutant
-
Gaseous pollutant
-
Aerosol
-
None of the above
Fine organic or inorganic particles suspended in air is called as aerosol particulate matter. It consists of soot, flash, and dust of various types, fur, hair, spores etc. It is classified into settleable and suspended particulate matter.
Which of the following is not a pollutant?
-
$SO _2$
-
$CO _2$
-
CO
-
$NO _2$
Carbon dioxide is described as pollutant or not a pollutant depending on the source of emission. The carbon dioxide which is released from the plants and animals as the end product of the respiration is not considered as a pollutant. The carbon dioxide gas which is released as the exhausts and emissions from the industries causes pollution and are referred as a pollutant. The main role of the gas is in increasing the temperature of Earth and so these are not pollutants.