Question

describe nitrogen cycle. in 100-150 words

Answer 1

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. 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 atmosphere 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.

Answer 2

Nitrogen forms nearly 78% or the largest part of the earth's atmosphere. But, atmospheric nitrogen is available only in a limited way for biological use. This, therefore, leads to a scarcity of usable nitrogen in many ecosystems.

Nitrogen cycle is the biogeochemical process by which nitrogen is converted into different chemical forms as it circulates in the atmosphere and in the terrestrial and marine ecosystems. The various processes in the nitrogen cycle can broadly be classified as fixation, ammonification, nitrification and denitrification. Ecologists are particularly interested in the nitrogen cycle as nitrogen's availability could affect the rate of the key ecological processes such as primary production and decomposition.