Question

Write a note on Biogeochemical cycle ?

Answer 1

The cycling of chemicals between the biological and the geological world is called biogeochemical cycle. The biotic and abiotic components of the biosphere constantly interact through biogeochemical cycles. During these interactions, there is a transfer of nutrients between living organisms and the non-living environment.

The four important biogeochemical cycles are water cycle, nitrogen cycle, carbon cycle and oxygen cycle.

Water cycle
Water in the soil, air and in water resources is restored through cyclic process called as water cycle. The water cycle involves various steps like evaporation, transpiration, condensation and precipitation.

Nitrogen cycle
The sequence in which nitrogen passes from the atmosphere to the soil and organisms, and then is eventually released back into the atmosphere, is called the nitrogen cycle.

Carbon cycle
Carbon is cycled repeatedly through different forms by the various physical and biological activities constituting the carbon cycle.

Oxygen cycle
The sequence in which oxygen from the atmosphere is used by organisms and eventually released back into the atmosphere through photosynthesis is called as oxygen cycle.