MP Board Class 12th Special English Important Questions Chapter 6 If the Well Goes Dry
I. Answer the following questions in about 50 – 60 words each:
What drives the cold ocean stream from the poles towards the equator?
As the warm ocean water from the tropics moves northward, part of it evaporates along the way. When it hits the cold polar winds between greenland and Iceland, the evaporation accelerates leaving behind much salter sea water which grows densor and heavier. This rapidly cooling water sinks to the bottom forming a deep current near the ocean floor. In the process, It transfers cold stream from the poles back towards the equator.
Write two ways in which global warming raises sea levels. (M.P. 2016)
Global warming raises the sea level in several ways. Higher average temperatures result in the melting of glaciers. The ice being discharges into the oceans from the ice caps of Antartica and Greenland, raise sea levels.
What causes the average hurricane to be more powerful? How?
Warming causes the average hurricane to be more powerful. The depth and warmth of the oceans top layer is the single most important factor is determining the speed of hurricane winds.
How do the forests produce rain-clouds?
Forests produce rain clouds partly because of evapotranspiration. Transpiration is the plan equivalent of sweat, add to it the evaporation. Forests may also attract rain by producing gases called terpene and small amounts of a compound called dimethylsulfide.
Describe the effects of chemical pollutants on mankind.
Chemical pollutants are the threat to human life. They cause severe contamina¬tion of water. They pollute atmosphere. Several diseases like cholera, typhoid, dysentery and diarrhoea from both viral and bacteriological sources are caused by these pollutants.
What should we do to solve the problem of fresh water? (Imp.)
Since human beings are the worst vicitim of the problem of the fresh water, they need to lasso their common sense. The rains bring us trees and flowers; the droughts bring gaping cracks in the world. The lakes and river sustain us slowing through the veins of the earth and into pur own. So we must be aware to take care to let them flow back out as pure as they came. We should not poison and waste them.
Where do chemical pollutants come from? (M.P. 2015)
The dramatic change in our relationship to the earth since the industrial revolution causes profound damage to the global water system. The chemical pollutants come from industries.
II. Answer the following questions in about 75 – 100 words each:
Write the chemical combination of the human body. In what way is the human body similar to the earth?
Human body is a combination of several chemical elements. Water is the most prominent of all of them. Human body contains 23 percent carbon, 2.6 percent nitrogen 1.4 percent calcium, 1.1 percent phosphours, with tiny amounts of roughly three dozen other elements Added to these we have 61 percent of oxygen and 10 percent of hydrogen fused together in the unique molecular combination known as water. A human body contains 71 percent of the human body.
How does global warming affect the climate pattern? (M.P. 2011, Imp.)
Global warming affects the climatic pattern of the earth in a very adverse manner. The health of the planet earth depends on maintaining a complex balance of interrelated system. Global warming is changing the way water is transferred from oceans to the land.
The increased warmth also increases the amount of water vapour in the atmosphere which magnifies the greenhouse effect and speeds the process still further. The global warming heats up the polar regions faster than the tropics. It changes the way the earth achieves a balance between hot and cold.
How does rising sea level threaten fresh water supply?
Global warming causes a rise in sea level in several ways. Higher average temperatures result in the melting of glaciers, in ice being discharge into the oceans from the ice caps of Antarctica and greenland and in the thermal expansion of the volume of the sea as its water warms. The rising seas would push the water table up. Warning oceans are also likely to cause the average hurricane to be more powerful.
More powerful and more frequent storms coming into the land from the ocean would in turn greatly exacerbate the damage from rising sea levels. It would change the entire water cycle and cause great damage to our fresh water system.
Describe the effects of deforestation on the ecosystem. (M.P. 2012,14,18)
Widespread deforestation is a great concern for the future of human life. The destruction of a forest can affect the hydrological cycle. More water is stored in the forests of the earth especially the tropical rain forests. Forests themselves produce rain clouds partly because of evapotranspiration. Immediately after the rainfalls on a rain forest, a fine mist begins to float back into the sky. It increases both the humidity in the air and the odds of more rain.
Forests also attract rain by producing gases called terpenes and small amounts of a compound called dimethylsulphide. They float into the atmosphere as a gas, the tiny ‘grains’ around which droplets of rainwater form. The deforestation would cause damage to ecosystem as it would cease these contribution of the forests and thereby the rain and mist.
Describe the effects of population growth on the global water system. (M.P. 2010)
Population growth is one of the major factors which threatens the existence of human life. Population is growing at a very rapid speed but resources are limited. Naturally the pressure of population is becoming grave on the resources as a result resources are exhausted. Because the speed of the ability of nature to refill or recharge its resources is much more slow than the speed of growth of human population. Hence resources are sinking. We are cutting forests digging earth all on invitation to our own doom.
III. Answer the following questions in about 150 words each:
Man is paving the path of his own doom. How?
Man is the most sensible creature who takes everything logically and wisely and make his destiny. But sometimes it is felt that he himself is paving the path of his own doom. There are a number of reasons behind such feelings. First man himself is responsible for the rapid population growth which is one of the many causes of man’s doom.
As the population grows, a pressure is created on the resources which are limited in number or amount. Its refilling or recharging speed is very slow. Hence resources in all their capacity fail to fulfil I the human need. As a result man over exhaust and extract the resources for this need. It damages the ecosystem in fact the entire system of life.
We neither have enough habitation, nor enough water to drink, nor sanitation, nor education and above all not a heatlhy living condition. We are polluting the whole atmoshphere water, food etc. Only we can save ourselves with his sensible approach otherwise we are doomed.
Recount and explain the five strategic threats to the global water system, as described by Al Gore.
Al Gore in a very specific manner recounts five major threats to the global water system redistribution of fresh water supply. The rise of sea levels resulting in the low-lying coastal areas, wide-spread deforestation, contamination of water resources and the pressure of rapid population growth.
We depend largely on fresh water which is only 2.5 per cent of the total amount of water on earth. Most of that is locked away as ice in Antarctica and to a lesser extent in greenland, the north polar ice cap and mountains glaciers. Ground water makes, up most of what remains leaving less than 0.01 per cent for all the lakes, creeks, Streams, rivers and rainfalls. This still leaves more than enough water to meet all our need, but it is distributed unevenly throughout the world.
As a result, human civilization has been restricted to more or less the same geographic pattern. Any lasting alteration of that pattern would therefore pose a strategic threat to global civilization. In the same way rise in the sea due to the global warming is damaging the ecosystem. The widespread contamination of water cause several deadly diseases.
Deforestation causes flood frequent flood imbalance heat of temperature. The growth of population creates pressure on natural resources and they are damaging a lot. Man himself alone can save his future.