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.
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Explain the Staphylococcus - Characteristics of Bacteria? Staphylococcus - It is gram positive, nonsporulating facultative anaerobic cocci present in grape-like clusters. These
If jean-Baptiste de Lamarck was correct, than a. Natural selection would lead to the spread of favorable traits within a population b. Finches that stretched their beaks to access
What is the contraceptive mechanism of the IUD? The IUD (intrauterine device) is a piece of plastic coated with copper that is inserted within the uterus by a doctor. Copper is
Draw a diagram of transverse section of the spinal cord showing reflex are and label the following parts: (i) Afferent nerve fibre (ii) Grey matter (iii) Motor nerve fibre
What are caloreceptors
Autonomic Nervous System (ANS) Autonomic Nervous System functions without conscious control of central nervous system. This system controls the functions of cardio-vascular, ga
A new drug named AGON-CaSR has been developed that is an agonist at calcium-binding sites of CaSRs (Calcium-Sensing Receptors) in plasma membranes of parathyroid gland cells.
Q. How many are the well-known amino acids that form proteins in living beings? There are twenty different known amino acids that form proteins related to the genetic code of t
am not do erection,am sufferin from epididyme
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