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!
Human Impact on Nitrogen Cycle
Human activities are profoundly affecting the cycling of nitrogen in nature. Over 30 x 106 metric tons/yr. of N2 is fixed in the commercial production of fertilisers, an amount almost equal to that fixed biologically. The use of N2 fertilisers affect the distribution of N2 on earth. Much of the nitrogen in the harvested crops becomes animal and human waste in sewage waters and eventually enters the aquatic ecosystem through runoff and leaching. Nitrogenous compounds leached into the groundwater may be abundant in irrigation and drinking water where they can cause serious health hazards. Nitrogenous compounds entering the lakes have fertilising effect resulting in algal blooms and promote cultural eutrophication.
Excessive growth of phytoplankton in eutrophic lakes produces huge quantities of biomass and finally collapse due to nutrient exhaustion. The dead organisms are consumed by detrivores which use up the oxygen supply. This problem of cultural eutrophication is, however, more severe in the case of phosphorus additions rather than nitrogen. When fossil fuels are burned we add nitrogenous compounds to the air. Large quantities of nitrogen oxide (NO) are released from vehicles and most of the NU is converted to NO2 by combining with ozone (O3) in the atmosphere. NO2 is a toxic gas for 6umans and a cause of smog. It combines with water to form nitric acid, HNO3, which forms 30% of the strong acids in the acid rain.
Q How different is the amphibian heart from the fish heart? The fish heart has only two chambers, a ventricle and an atrium, and the blood that comes to it is purely venous.
1. What are the examples of helobial endosperm
Q. What are diseases of the connective tissue? What are some of them? Diseases of the connective tissue are acquired or hereditary diseases numerous of autoimmune cause charact
Q. How Time affecting taste quality? Time- Time is another factor which affects sensation. Salt on tongue is sensed in a fraction of a second; whereas, bitter things may requir
What are the typical vegetation and the typical fauna of the deserts? The predominant fauna of the desert ecosystems is formed by reptiles, like snakes and lizards, terrestrial
Synthetic Conduits Dacron, Polytetra fluro ethylene (PTFE) and polyglycolic acid grafts have extremely poor results and are not used any more.
Explain about the RNA Viruses - carcinogenic? All oncogenic RNA viruses are retroviruses. They are of 2 types. They are acute transforming retroviruses and slow transforming re
Day-Neutral Plants Besides SDP and LDP, those plants that flower irrespective of the length of light are called day-neutral plants. For these there is no specific requirement
How much ampicillin (sodium sal, mw=371.40) would you dissolve in 400 mL of water to make 80 mg/ml solution of ampicillin?
Define Need of vitamin A during pregnancy period? All four vitamins (A,C,E and K) have specific functions and a common role for all of them is to preserve the structural and fu
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