Question

1.What percent of the air is nitrogen?
2.Why is nitrogen essential to life?
3.How do plants and animals get nitrogen if not from the atmosphere?
4.What are nitrogen fixing bacteria?
5.What are some examples of nitrogen-fixing bacteria?
6.What is ammonification?
7. What are the two steps in nitrification?
8.Do all plants need nitrogen to be in nitrate form in order to absorb and use it?
9.What is denitrification?
10.Which organisms are responsible for denitrification?

Answer 1

1. 78%
2. Nitrogen Is Key to Life!
3. Nitrogen is a key element in the nucleic acids DNA and RNA, which are the most important of all biological molecules and crucial for all living things. DNA carries the genetic information, which means the instructions for how to make up a life form
4. All plants and animals need nitrogen to make amino acids, proteins and DNA, but the nitrogen in the atmosphere is not in a form that they can use
5. Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” compounds, such as ammonia, that are usable by plants. Nitrogen fixation.
6. Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella.
7. Ammonification is the last step of the nitrogen cycle involving an organic compound, and is the intermediary step between the depolymerization of large organic molecules and the nitrification step
8. Nitrification is a two-step process in which NH3/ NH4+ is converted to NO3-. First, the soil bacteria Nitrosomonas and Nitrococcus convert NH3 to NO2-, and then another soil bacterium, Nitrobacter, oxidizes NO2- to NO3-. These bacteria gain energy through these conversions, both of which require oxygen to occur.
9. Plant Nitrogen Needs and Uptake
10. Plants absorb nitrogen from the soil as both NH₄⁺ and NO₃⁻ ions, but because nitrification is so pervasive in agricultural soils, most of the nitrogen is taken up as nitrate. Nitrate moves freely toward plant roots as they absorb water.
11. Denitrification is the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen, principally nitrous oxide (N2O) and nitrogen (N2). A large range of microorganims can denitrify. Denitrification is a response to changes in the oxygen (O2) concentration of their immediate environment
12. Thiobacillus denitrificans, Micrococcus denitrificans, and some species of Serratia, Pseudomonas, and Achromobacter are implicated as denitrifiers. Pseudomonas aeruginosa can, under anaerobic conditions (as in swampy or water-logged soils), reduce the amount of fixed nitrogen (as fertilizer) by up to 50 percent.

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Answer 2

72%
For growth of plants and animals
From the soil