Describe the nitrogen cycle - KCSE Biology Essays.
Here is an essay on the nitrogen cycle. Nitrogen is one of the important elements in biological compounds, mainly of nucleic acid and protein and, therefore, it is essential for life. Atmosphere contains about 78% nitrogen, but free nitrogen cannot be utilised by most of the organisms, except a few blue green algae and some bacteria.
The nitrogen cycle Nitrogen compounds found in cells include proteins. Nitrogen from the air is converted into soluble ions that plant roots can absorb. It forms part of nitrogen compounds in the.
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Essay B. 10 (b) A cycle is a biological pathway or process in which the end product of one cycle becomes the starting point for the next. Write an essay about cycles in biology. Marking guidance Mark Comments Ecological cycles Nutrient cycles Carbon cycle Nitrogen cycle Biochemical cycles Enzyme action Synthesis of ATP from ADP.
The first step of the nitrogen cycle is nitrogen fixation. Special bacteria use an enzyme known as dinitrogenase to convert nitrogen gas to ammonia. Next, nitrification converts the ammonia into nitrite ions, which the plant roots absorb as nutrients. Animals take in their nitrogen by eating the plants.
The movement of nitrogen from atmosphere to living organisms and back into the atmosphere exists as a continuous, self-sustaining cycle. However, human activities such as deforestation can affect this cycle by causing reduced input to the nitrogen cycle, slower and reduced recycling of nitrates and increased loss of nitrates by leaching.
A cycle is a biological pathway or process in which the end product of one cycle becomes the starting point for the next. Write an essay about cycles in biology.
Nitrogen gas is converted into nitrates. This is carried out by nitrogen fixing bacteria. Nitrogen fixing bacteria need oxygen as they are aerobic. This process is quickened by the presence of.
Detailed revision notes on the topic The Nitrogen Cycle. Written by teachers for the Edexcel (9-1) IGCSE Biology course.
Nitrogen cycle The biogeochemical cycles make multiple biological processes possible: photosynthesis, protein synthesis, respiration Many stages of these cycles could not be possible without activity of the living beings: bacteria, fungi, plants and animals.
There are also biological cycles that occur around us in the outside world such as the carbon cycle and the nitrogen cycle. I have decided to focus my essay on the biological cycles that occur inside organisms. The cardiac cycle is vital in all organisms with a heart, to pump blood round the body.
The nitrogen cycle refers to the cycle of nitrogen atoms through the living and non-living systems of Earth. The nitrogen cycle is vital for life on Earth. Through the cycle, atmospheric nitrogen is converted to a form which plants can incorporate into new proteins.
A cycle is a biological pathway or process in which the end product of one cycle becomes the starting point for the next. Write an essay about cycles in biology 1) Nitrogen cycle.
