Question

Draw Nitrogen Cycle and explain it.

Answer 1

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among the atmosphere, terrestrial, and marineecosystems. The conversion of nitrogen can be carried out through both biological and physical processes. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification. The majority of Earth's atmosphere (78%) is nitrogen, making it the largest source of nitrogen. However, atmospheric nitrogen has limited availability for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production and decomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.

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Answer 2

➡️ NITROGEN FIXATION - The process of converting atmospheric nitrogen into nitrates and nitrites which are soluble in water this is done by waste nitrogen fixing bacteria example rhizobium , blue green algae and bacteria azatobacter .

➡️ AMMONIFICATION - It is the process of decomposing complex dead organic matter into Ammonia this is done by micro organisms living in the soil example decay bacteria and fungi .

➡️ NITRIFICATION - It is the process of conversion of ammonia into nitrites and then into nitrates this is done by nitrifying bacteria example - nitrosomonas and nitrobacter .

➡️ DENITRIFICATION - it is the process of reducing nitrates present in the soil to release Nitrogen gas back into the atmosphere examples - pseudomonas, achrombacter .