Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Soil Pollution:
The problem of soil pollution is rapidly increasing in the rural, urban and industrial areas due to unscientific and irrational disposal of solid wastes generated by human beings from their domestic and industrial activities. In many rural parts of our country, daily thousands of people pollute the soil through their wastes, as toilet facilities are not available. In industrial areas heavy metals, plastics and other persistent organic compounds including msticides, are the major causes of soil pollution. Hazardous wastes in soil, often accummulate in the bodies of organisms including man, because they are not excreted. Once they enter the food chain, they become more concentrated at each level. Note in Fig. how DDT, a pes'ticide, becomes more concentrated as it passes along fmm producer to consumers. The story of DDT is one everybody should know. It was once a widely used pesticide. It is a substance that does not easily break down. It can persist in the environment for as long as fifteen years. It enters birds through the organisms they feed on which in turn get it from the organisms lower in the food chain. When a high concentration builds up in birds. their reproductive systems are affected. As a result they lay fragile eggs that easily break in the nests. Similarly other pesticides are also major soil pollutants, because of their retention in soil. The pesticides not only kill the targeted pests, but also kill many harmless and even beneficial insects. They cause more harm than benefit. Therefore, DDT and many such agrochemicals have been banned in many parts of the world.
What should be done to minimise soil pollution? First of all, in India, the use of open fields and banks of ponds and tanks as open toilets should be stopped, by providing latrines. Care should be taken while dumping wastes in the soil. Substances such as heavy metals, plastics and other substances that remain unchanged for very long time should not be added to the soil. Instead ways should be found for their reutilisation by various recycling processes. Utmost care should be taken so that the minimum necessary pesticides or other agrochemicals are used. In fact. biological control of pests and fixation of nitmgen should be urgently developed by rcsearch, so that dependence on widespread use of toxic chemicals is reduced.
Carbon l4 with a half-life of 5,568 years is used to date a sample of wood. Sample has l/8 the carbon l4 contained in a living tree of same species. Approximately how old is specim
In Pursuit of Starlight: The easiest method of studying light from a cosmic object is to collect it through a telescope and record it on a photographic plate. photographic plat
Communication Revolution: It is in this background, that communication revolution is being ushered in ou: country. In the recent years, the rural people who have access to T
why do we study science?
hui
Even though most of the attention in cognitive neuroscience has been focused on studying the role of gray matter brain areas / structures in perceptual and cognitive functions, it
Explain the Organs of the Urinary System The figure illustrates the organs of the urinary system. As is evident, the organs of the urinary system consist of 2 kidneys, 2 uret
Explain Asphyxia - Histotoxic Hypoxia Improper aeration of blood produces a series of pathological manifestation and ultimately death. The symptoms are collectively called asph
Why is the idea of modern human "races" is not considered a valid biological concept, and why is the idea of clinal variation more acceptable to biologists?
Question 1 What are the different types of budgets? Explain the budgeting process for healthcare services Question 2 Explain the concept of demand and supply in healthcare
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd