JAM Classes

  Marine Pollution The change in the physical chemical and biological properties of sea water upon the addition of toxic pollutants from a variety of source either intentionally or unintentionally which can have a devastating impact particularly on marine biodiversity is referred to as marine pollution. According to UN the introduction by man directly or indirectly of substances or energy to the marine environment resulting in deleterious effects such as: hazard to human health, hindrance to marine activities impairment of the quality of seawater for various uses and reduction of amenities. Types of marine pollution The circle of marine pollution is quite vast which encompass many types of pollution which have an adverse effect on marine ecosystem. these are: Chemicals Light Noise plastic pollution Sources of marine pollution 1. Domestic Sewage The sewage disposal into rivers lakes etc. ultimately reach the marine ecosystem it contains a variety of pathoge...

    Previous Year Question Papers of Jammu and Kashmir State Board of School Education ENVIRONMENTAL SCIENCE CLASS:  12th            Year  2018   Time: 3 Hours                Maximum Marks: 70                       Long Answer Type   Questions                                                   (5   Marks Each) 1. Define air pollution . Describe any four sources of air pollution. Or  Describe very briefly any five measures taken by Govt. of India in controlling air     pollution 2. Write a detailed note on survivorship curves. Or Define population dynamics. Explain any four factors which affect population and its growth. 3. Define ecosystem stability and write a deta...

  Control of water pollution Water is one of the precious resource but in the present scenario this resource is under great threat and become a matter of great concern throughout the globe. Humans have polluted the water resources beyond expectation if this will continue and if no royal step is taken, no doubt in the near feature this problem become even worse this will not affect the humans but all other living creatures which finally create an ecological imbalance. Keeping this in view control of water pollution should be on the top of our priorities. As we know that sources of water pollution come from two sources point and non-point source. the former can be controlled easily whereas latter one is bit difficult. Control of the point source pollutants should be achieved by adopting the procedure of end of pipe controls and process control. Following control measures should be taken into consideration Domestic waste should not be thrown directly into water bodies. Domestic se...

Biomagnification In order to explain biomagnification the concept of bioaccumulation should be made clear first, as far as the term bioaccumulation is concerned it is the process whereby toxic chemicals or we can say pollutant accumulate in the target tissues of organisms. Bioaccumulation takes place when the rate of toxic chemicals exceeds the rate of its elimination. Bioaccumulation occurs within a trophic level. Now this will ease in understanding the concept of bio magnification. The process of cumulative increase in the concentration of accumulated toxic substances at each successive trophic level is referred to as biomagnification. It is also known as bio amplification or biological magnification. Hence it is clear from the above two definitions that toxic substances which accumulate in organisms goes on increasing or magnifying along the trophic levels and reach to its maximum concentration at top level. Therefore, the term magnification is used. Toxic chemical polluta...