The atmospheric nitrogen are made available to the plants when nitrogen fixing bacteria or rhizobia fixed atmospheric nitrogen and convert them into ammonia (NH3) in the presence of nitrogenase under different conditions such as, in loose association with other organisms, or in a symbiotic manner with them. The process whereby atmospheric nitrogen is reduced to ammonia in the presence of nitrogenase (found naturally in microorganisms viz. Rhizobium, free living Azotobacter etc) is called Biological nitrogen fixation (BNF). The best example for the symbiotic
: cause diseases in humans and crops. Bacteria play an important role in the nitrogen cycle. Nitrogen fixing bacteria convert nitrogen into nitrates and denitrifying bacteria convert nitrates into nitrogen. Bacteria can cause food poisoning. If food is contaminated or not stored properly bacteria will grow and will make you very sick Some bacteria are used to combat pollution known as Bioremediation.
However it is sometime considered that the soil health is depends on biological activities held in the soil. There are few controversies about role of soil in plant growth and yield, as few belifs on its direct effect on plant growth and yield, while rest consider that it mere provide physical support and the growth and yield are the result of non-soil components, such as fertilizer and pesticide. Soil organisms contributes significantly in soil health through various ways such as, humus formation, decomposing dead plant and animal residues, enrichment of soil organic matter, etc. They produces carbon dioxide in soil to be dissolved in water and further converted in carbolic acid, which breakdowns insoluble rock minerals (Edwards et al. nd.).
Human influences on soil erosion Aspect 1: The effect overgrazing has on soils. Overgrazing is when a farmer stocks (Keeps) too many animals in their land. Examples of such animals are sheep, which pull up the roots of plants, cattle, which kick up the top layer of dirt which is then blown away by the wind, and goats. These animals all damage the surface of the soil and speed up soil erosion. These animals eat the vegetation cover of the area and their hooves dig into the soil, which compacts it into a hard surface in dry regions, meaning it is given a platy structure, which is a very poorly drained soil structure.
Contaminated water may contain high levels of nitrates and nitrites, causing haemoglobin disorders. Moreover, (April 2015) Environment associations says that most of the people all know that fertilizers are used for proper and healthy growth of plan but are they really healthy and what exactly are fertilizers and how do fertilizers affect the environment. It is a fertilizer is a substance, be it synthetic or organic which is added to the soil in order to increase the supply of essential nutrients that boost the growth of plants and vegetation in that soil. With the rapid increase in population globally, the demand of food and agricultural give in has been rising very highly. This is the reason why statistics show that almost 40-60% of agricultural crops are grown with the use of different types of fertilizers not only this, more than 50 percent
Many bacteria such as Enterobacteriaceae and Staphylococcus are facultative anaerobes. Aerotolerant Aerobes This group of bacteria get their energy from fermentation alone but unlike anaerobes they are not affected by the presence of oxygen. An examples of such as bacteria is Lactobacillus which is part of the normal flora of the gut and vaginal tract. Microaerophiles Microaerophilic bacteria require oxygen for growth and multiplication but at levels lower than found in the atmosphere. They are killed by high oxygen concentration and an example is Helicobacter pylori, a bacteria that can cause stomach
The inorganic forms of nitrogen present in wastewater are ammonium (NH4 +), nitrite (NO2 -) and nitrate (NO3 -). When plants uptake at low loading rate, all the inorganic form of nitrogen are converted into organic compounds that serve as building blocks for cells and tissues. High concentration of nitrogen in the domestic and industrial wastewater causes a very serious problem of eutrophication in wastewater receiving bodies. Nitrogen may be removed from wastewaters by several processes in CWs like adsorption, volatilization, plant adsorption & uptake, ammonification and nitrification-denitrification are the most important removal pathways around the root zone. The major process responsible for nitrogen removal during wastewater treatment in wetlands is nitrification, denitrification complex mediated by the microorganisms.
This is why ecosystems are so important, all organisms that live in an ecosystem depend on each other, no matter how big or how small. Interactions within this ecosystem become critical for their survival. There are many different kinds of interactions between organisms in an ecosystem and it is not unusual for any particular organism to play multiple roles in “the food chain”. Humans can be consumers and predators. We can hunt, kill, and eat other animals such as fish or deer, or can eat chicken from a grocery store or restaurant.
Importance of forests Importance of Forest is as below. IV. Bring Rainfall: Forests are responsible for rains on the land. Due to forests, the clouds get cooled and convert to rain water. So one can notice heavy rainfall in the areas of forests and around.
Chemistry has a significant role because it is all around us in our daily life air, water and food we eat all contain vitamins and minerals. More critical is medicine we take to cure disease, without chemistry they do not exist (Helmenstine). 5. Explain why water is so important to life on earth. (5) Water promotes life in numerous ways.