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💡 Nothing is ever lost
The same carbon, nitrogen and water atoms have cycled through rocks, air, oceans and living bodies for billions of years — endlessly recycled between the living and the non-living world.
What is a biogeochemical cycle?
- Living organisms constantly exchange matter and energy with the air, water, soil and rocks around them.
- The cyclic movement of matter between the non-living (abiotic) and living (biotic) components is called a biogeochemical cycle .
- These cycles keep essential nutrients — carbon, nitrogen, oxygen — recycled and available to support life, and help ecosystems recover from disturbances.
NCERT Question 1 — Choose the most appropriate option
Choose the most appropriate option to describe the role of biogeochemical cycles in an ecosystem. (i) To provide food directly to all organisms. (ii) To recycle essential nutrients between biotic and abiotic components. (iii) To create new elements for use by living things. (iv) To remove pollutants and toxins from the organism.
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