The nitrogen which plants absorb comes from?
Nitrogen compounds known as Nitrates found in the soil
Yes. Vascular plants can absorb nitrogen compounds such as nitrates from the soil on their own. What plants can't do on their own is fix nitrogen from the air into nitrogen compounds. Some plants including legumes (such as peas, beans, lupins) and casuarinas form symbioses with nitrogen-fixing bacteria to form nitrogen into nitrogen compounds.
Plants absorb nitrate compounds from soil through their root hairs, which are outgrowths of the trichoblast cells in the roots. Most plants are not able to use nitrogen as such (N2), though some, including legumes and casuarinas, supply water and food to symbiotic nitrogen-fixing bacteria in specialised root nodules, and these fix nitrogen to nitrate which they supply to the plants.
If you are told it is a fact that animals do not need nitrogen, you can infer that you are receiving incorrect information. All living things require nitrogen. However, animals are not able to obtain the nitrogen they need directly, but must get it from their food, and that comes ultimately from the plants that are able to absorb nitrogen from the soil.
plants and animals are not adapted to absorb nitrogen from the air. Nitrogen Fixation is a process where nitrogen is changed into a more reactive form for plants and animals to use. There are several ways where nitrogen fixation can happen: lightning, bacteria, carnivorous plants and industrial fixation.
Some plants are leguminous and have root nodules by which they are able to directly absorb the nitrogen from the atmosphere. If the are not leguminous, they get the nitrogen from the soils via their roots. For the same purpose of supplying nitrogen to the plants, farmers also add nitrogenous fertilizers to the soil which provides sufficient amount of nitrogen to the plants
Plants can not absorb atmospheric elemental Nitrogen (N2). The nitrogen must be bound to carbon or hydrogen atoms such as ammonia (NH3), or Urea (NH2)2CO. Nitrogen Fixing Plants such as clover have a symbiotic relationship with bacteria on their root system that convert atmospheric nitrogen (N2) to forms that the plants can use.
Legumes. They are the primary plant in an ecosystem, and help convert atmospheric nitrogen in nitrogen in the soil that plants can absorb through their root systems. The process is called nitrogen fixation. The organisms involved in nitrogen fixation are nitrifying bacteria like Azatobacter and Pseudomonas forming root nodules in legumenous plants.
Decomposers produce nitrogen compounds that plants can absorb through their root systems. Both plants and animals synthesize complex nitrogen compounds, such as purines and pyrimidines (the bases in nucleic acids) and proteins. When these organisms die, when animals leave droppings, and when plants drop leaves, these proteins and other organic nitrogen compounds accumulate on the ground in a form that plants cannot use. If there were no decomposers, nitrogen would be locked up in this…
A lot of comes from the air. The air you breathe is around 78 percent nitrogen, so nitrogen enters your body with every breath. Rhizobium bacteria is present in leguminous plants in their roots which extract nitrogen from the soil. These are generally present in dicot-seed plants. When you consume these plants, nitrogen enters your body. Another way that nitrogen enters the body is through eating meat. When animals eat plants, those plants have nitrate…