Inside the cells of a leaf photosynthesis occurs. Specifically, it takes place in the chloroplast of the leaf cell. When solar energy hits the leaf it excites electrons within the chloroplast. This energy allows for water and carbon dioxide to create the products of photosynthesis which are .

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

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